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Monster Research Facility #4
The Harbinger's Redemption: a Monster Romance
Will their love save the world, or end it?
As the sole survivor of a doomsday cult, Willow Hawkins isn’t easily rattled. It makes her well-suited for a security gig at a monster research facility.
But Subject X-16 isn’t a monster. Not yet, at least. Beneath his sprouting feathers and numerous red eyes, he’s a sweet and lonely young man terrified by what he’s turning into.
When Willow discovers she’s the only one immune to his strange and dangerous “episodes,” it feels like fate. She’s always believed that she survived for a reason, and perhaps he is that reason. As she races against time for a way to control X-16’s eruptions of uncanny power and stop his gruesome transformation, she can’t help but care for him. Yet the closer they become, the more she sees signs of the apocalypse her childhood cult foretold.
If Sixteen completes his transformation, it might mean the end of the world. So did fate bring Willow here to save the man she’s falling for, or to kill him and prevent the apocalypse?
As the sole survivor of a doomsday cult, Willow Hawkins isn’t easily rattled. It makes her well-suited for a security gig at a monster research facility.
But Subject X-16 isn’t a monster. Not yet, at least. Beneath his sprouting feathers and numerous red eyes, he’s a sweet and lonely young man terrified by what he’s turning into.
When Willow discovers she’s the only one immune to his strange and dangerous “episodes,” it feels like fate. She’s always believed that she survived for a reason, and perhaps he is that reason. As she races against time for a way to control X-16’s eruptions of uncanny power and stop his gruesome transformation, she can’t help but care for him. Yet the closer they become, the more she sees signs of the apocalypse her childhood cult foretold.
If Sixteen completes his transformation, it might mean the end of the world. So did fate bring Willow here to save the man she’s falling for, or to kill him and prevent the apocalypse?
270 pages, Kindle Edition
Published April 30, 2026
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Displaying 1 - 30 of 84 reviews
September 9, 2026
The finale to an EPIC series 📚
That was WILD 😝
I have honestly had so much fun reading this wildly original Monster romance series; I never thought I could love monsters so much, but here we are. I have thoroughly enjoyed each and every book, the third book being my favourite. They have all been highly imaginative, each having their own quirks. This particular instalment had had a totally different feel to the others, and while it wasn’t my favourite, I still enjoyed it 😈
Skyla Gray takes on her biggest challenge yet in this apocalypse monster romance. She explores survivor guilt, trauma, and choosing love - Will their love save the world, or end it? 🌎 ❤️🔥 😈
Willow has lived her whole life carrying survivor guilt. As the sole survivor of a doomsday cult, she's always believed that she survived for a reason. So when a high risk security job at MRF comes up, she sees it as her chance to make a change. But Subject X-16 isn't like the other monsters. His threat goes beyond his cell walls. He’s a lonely, terrified young man, morphing into something with feathers and numerous red eyes 👀 The team quickly discover Willow is the only one immune to his increasingly dangerous episodes. As they race against time to control his powers, Willow can’t help but care for this troubled young man. With the apocalypse on the horizon, and Sixteen coming closer to completing his transformation, Willow is left wondering if fate brought her to save him or to kill him to prevent the apocalypse…
Willow is a badass survivor! She is such a multi-dimensional character. There is a strong, independent, and boss-woman side to her, but she is also a guarded, wounded soul that has had her life stripped away from her. I admired her want to do good despite the challenges. In the face of obstacles, her desire and loving tenderness was obvious.
I actually felt so sad for Sixteen 😢 He didn’t ask for what happened to him, in fact he voluntarily admitted himself to the MRF so that he would do no harm 🥺 He was so unsure of himself, and his hesitation made him all the more sweet. I loved watching him transform over time, learning to trust Willow and accept love.
WELL that was different 👀 I can tell you right now: this is a romance like no other! I love how every couple in this series has had a completely different relationship dynamic. While this romance started off sweet and comforting, it turned into intense intimacy. It was somewhat of a slow-burning romance, always there in the background, without taking away from the overall storyline. And that action/romance packed ending? 😮💨 no words can explain 🫣
“I’m a monster,” he whispers in protest. “Then you’re my monster.” ❤️🔥
Overall, I highly recommend this series as a whole. It is definitely worth while reading the full series to fully appreciate all the characters and setting. At its core, this story is a suspenseful monster romance but it also deeply explores many aspects of trauma. It is terrifying, sweet, intimate, and HIGHLY ADDICTIVE! I am so excited for the prequel to come out later this month 🙇🏻♀️
4 🌟🌟🌟🌟
That was WILD 😝
I have honestly had so much fun reading this wildly original Monster romance series; I never thought I could love monsters so much, but here we are. I have thoroughly enjoyed each and every book, the third book being my favourite. They have all been highly imaginative, each having their own quirks. This particular instalment had had a totally different feel to the others, and while it wasn’t my favourite, I still enjoyed it 😈
Skyla Gray takes on her biggest challenge yet in this apocalypse monster romance. She explores survivor guilt, trauma, and choosing love - Will their love save the world, or end it? 🌎 ❤️🔥 😈
Willow has lived her whole life carrying survivor guilt. As the sole survivor of a doomsday cult, she's always believed that she survived for a reason. So when a high risk security job at MRF comes up, she sees it as her chance to make a change. But Subject X-16 isn't like the other monsters. His threat goes beyond his cell walls. He’s a lonely, terrified young man, morphing into something with feathers and numerous red eyes 👀 The team quickly discover Willow is the only one immune to his increasingly dangerous episodes. As they race against time to control his powers, Willow can’t help but care for this troubled young man. With the apocalypse on the horizon, and Sixteen coming closer to completing his transformation, Willow is left wondering if fate brought her to save him or to kill him to prevent the apocalypse…
Willow is a badass survivor! She is such a multi-dimensional character. There is a strong, independent, and boss-woman side to her, but she is also a guarded, wounded soul that has had her life stripped away from her. I admired her want to do good despite the challenges. In the face of obstacles, her desire and loving tenderness was obvious.
I actually felt so sad for Sixteen 😢 He didn’t ask for what happened to him, in fact he voluntarily admitted himself to the MRF so that he would do no harm 🥺 He was so unsure of himself, and his hesitation made him all the more sweet. I loved watching him transform over time, learning to trust Willow and accept love.
WELL that was different 👀 I can tell you right now: this is a romance like no other! I love how every couple in this series has had a completely different relationship dynamic. While this romance started off sweet and comforting, it turned into intense intimacy. It was somewhat of a slow-burning romance, always there in the background, without taking away from the overall storyline. And that action/romance packed ending? 😮💨 no words can explain 🫣
“I’m a monster,” he whispers in protest. “Then you’re my monster.” ❤️🔥
Overall, I highly recommend this series as a whole. It is definitely worth while reading the full series to fully appreciate all the characters and setting. At its core, this story is a suspenseful monster romance but it also deeply explores many aspects of trauma. It is terrifying, sweet, intimate, and HIGHLY ADDICTIVE! I am so excited for the prequel to come out later this month 🙇🏻♀️
4 🌟🌟🌟🌟
May 24, 2026
Sixteen was just the most precious boi and I wanted to give him all the lovies for the shit hand he’d been dealt in life. His uncontrollable “episodes” and continuously changing body were traumatic for him and everyone else. He was an absolute soft sad boi. Willow was grumpy and closed off, but pretty immediately was protective of Sixteen. Their relationship was messy and complicated, what with her being a security guard and only person who could stand to be near him, and him being a subject to committed himself to the facility to protect the people around him. The ex-religious cult themes were awesome and horrible. The mystery of what he was becoming, the danger he posed to others through no fault of his own, it was all good.
Spice: 3/5
Triggers: body horror, violence, gore, dismemberment, semi-cannibalism, blood, murder, attempted human sacrifice, death, mind control, institutionalization, confinement, doomsday cult, brain washing, mass death via poisoning including of children, vomiting, PTSD, invasive medical tests, kidnapping, head trauma, sedation, discussion and threat of apocalypse, bugs coming out of mouth, exorcism, blood rain, isolation, suicide (side character), suicide attempt (main character), discussion and request for assisted suicide, gun violence, death of parent, past child neglect/cruelty, mentions of the devil, burns, car crash, nightmares
Spice: 3/5
Triggers: body horror, violence, gore, dismemberment, semi-cannibalism, blood, murder, attempted human sacrifice, death, mind control, institutionalization, confinement, doomsday cult, brain washing, mass death via poisoning including of children, vomiting, PTSD, invasive medical tests, kidnapping, head trauma, sedation, discussion and threat of apocalypse, bugs coming out of mouth, exorcism, blood rain, isolation, suicide (side character), suicide attempt (main character), discussion and request for assisted suicide, gun violence, death of parent, past child neglect/cruelty, mentions of the devil, burns, car crash, nightmares
July 2, 2026
Dominant lady security guard in her 30s / submissive antichrist who REALLY wants to be good and not cause the apocalypse :/
You are all missing out on this series !! I don’t know why no one else is reading it. These are the best monster romances around. Interesting relationship dynamics and the perfect blend of horror, romance, and a sprinkle of scifi elements.
You are all missing out on this series !! I don’t know why no one else is reading it. These are the best monster romances around. Interesting relationship dynamics and the perfect blend of horror, romance, and a sprinkle of scifi elements.
May 2, 2026
Thank you to BookSirens for an advanced copy of this book!
Woah. This is a weird one, but it was absolutely my kind of weird. I could not put it down and read almost all of it in one sitting. It's my first ARC from BookSirens and now I'm very intrigued to pick up more.
I went in with extremely low expectations. I was prepared for poor editing and flat characters, and I feel guilty about it now. This feels like a project from someone who put a lot of care and thought into it, and it read smoother and emotionally resonated stronger than some traditionally published books I've read. Willow was an easy character to latch onto, and her chemistry with the sympathetic and sweet X-16 was perfect. I don't want to say too much else, because a lot of the things I really enjoyed were subversions of my expectations.
One thing that could strike as negative is that there's a lot of religious content. The main character has some religious trauma and the plot really wants to make her think about it. As someone who went to Catholic school her whole life and is very much an atheist, this made me feel some squirmy discomfort, but not in the way that I've felt when reading Christian Fiction (which I have done by accident a few times.)
I have not read the other books in the series, but if they're all this good I have absolutely been missing out. This was dark, creative, grotesque, hopeful, and romantic all at once and all in perfect balance.
Content Warnings:
Graphic: Body horror, Death, Sexual content, Blood
Moderate: Confinement, Cursing, Gore, Violence, Medical content, Religious bigotry, Alcohol, Injury/Injury detail
Minor: Self harm, Suicidal thoughts, Suicide, Vomit, Suicide attempt, Death of parent
Woah. This is a weird one, but it was absolutely my kind of weird. I could not put it down and read almost all of it in one sitting. It's my first ARC from BookSirens and now I'm very intrigued to pick up more.
I went in with extremely low expectations. I was prepared for poor editing and flat characters, and I feel guilty about it now. This feels like a project from someone who put a lot of care and thought into it, and it read smoother and emotionally resonated stronger than some traditionally published books I've read. Willow was an easy character to latch onto, and her chemistry with the sympathetic and sweet X-16 was perfect. I don't want to say too much else, because a lot of the things I really enjoyed were subversions of my expectations.
One thing that could strike as negative is that there's a lot of religious content. The main character has some religious trauma and the plot really wants to make her think about it. As someone who went to Catholic school her whole life and is very much an atheist, this made me feel some squirmy discomfort, but not in the way that I've felt when reading Christian Fiction (which I have done by accident a few times.)
I have not read the other books in the series, but if they're all this good I have absolutely been missing out. This was dark, creative, grotesque, hopeful, and romantic all at once and all in perfect balance.
Content Warnings:
Graphic: Body horror, Death, Sexual content, Blood
Moderate: Confinement, Cursing, Gore, Violence, Medical content, Religious bigotry, Alcohol, Injury/Injury detail
Minor: Self harm, Suicidal thoughts, Suicide, Vomit, Suicide attempt, Death of parent
October 21, 2026
This book started off so well. I loved Willow, she was a strong character and I adored Sixteen as well, seeing them interact at the start was gorgeous.
It quickly lost me when the religious aspect became a bit much. I'm not religious in the slightest and I did struggle with that part. I found the ending to do a bit daft, wait I know that makes no sense, it's a monster romance book in the first place 🤦🏻♀️ but it just didn't seem to make sense to the storyline.
I still really enjoyed the book though, I just wish the religious theme had been dialled back a bit.
It quickly lost me when the religious aspect became a bit much. I'm not religious in the slightest and I did struggle with that part. I found the ending to do a bit daft, wait I know that makes no sense, it's a monster romance book in the first place 🤦🏻♀️ but it just didn't seem to make sense to the storyline.
I still really enjoyed the book though, I just wish the religious theme had been dialled back a bit.
April 21, 2026
Fantastic addition to the Monster Research Facility series by Skyla Grey, The Harbinger’s Redemption is a heart-wrenching forbidden love story.
As only one of two people to survive a cult as a six year old child after a mass su!c!de in the vein of the Jonestown Massacre, Willow is a new hire at MRF, a high security facility that houses supernatural beings. It soon becomes evident that she’s the only person who can be in the presence of subject X-16 without discomfort or outright injury. She becomes fascinated by and deeply sympathetic toward Sixteen, while others are maimed or killed, however unintentionally.
Changeling X-16 has voluntarily checked himself into MRF because he’s convinced he’s a danger to himself and the public at large. Drastic changes have been happening to him bodily and mentally, and his effect on others is often violent and unpredictable.
Willow discovers that the doomsday cult from which she narrowly escaped with her life as a young girl is still in operation and they believe that sacrificing X-16 is their ticket to “saving” the world. Meanwhile, deep feelings are developing between Willow and X-16.
Can they escape the clutches of the madmen and women trying to k!ll them? Or will the current iteration of the cult succeed where the previous one failed?
I received an advance reader copy from the author, and I’m pleased to share my honest review.
As only one of two people to survive a cult as a six year old child after a mass su!c!de in the vein of the Jonestown Massacre, Willow is a new hire at MRF, a high security facility that houses supernatural beings. It soon becomes evident that she’s the only person who can be in the presence of subject X-16 without discomfort or outright injury. She becomes fascinated by and deeply sympathetic toward Sixteen, while others are maimed or killed, however unintentionally.
Changeling X-16 has voluntarily checked himself into MRF because he’s convinced he’s a danger to himself and the public at large. Drastic changes have been happening to him bodily and mentally, and his effect on others is often violent and unpredictable.
Willow discovers that the doomsday cult from which she narrowly escaped with her life as a young girl is still in operation and they believe that sacrificing X-16 is their ticket to “saving” the world. Meanwhile, deep feelings are developing between Willow and X-16.
Can they escape the clutches of the madmen and women trying to k!ll them? Or will the current iteration of the cult succeed where the previous one failed?
I received an advance reader copy from the author, and I’m pleased to share my honest review.
October 1, 2026
100/10 STARS. ⭐️
Skyla girl… we gotta get a drink or something. I consider you a homie at this point. 😂 I know I can always count on you for an EXCEPTIONAL read with this series. 🙂↕️
I’m not even lying when I say this series has quickly and easily become quite possibly my favorite series ever. I love the entire premise, the uniqueness is unmatched, and every single book manages to suck me in just as hard as the last. This one was absolutely no different.
I was hooked from the first word. I stayed up until 1 AM reading and finally told myself I had to go to sleep when I realized I still had an hour and a half left in the book. I SHOULD HAVE JUST STAYED UP AND FINISHED IT. Because what did I do instead? Lay in bed awake for the next hour and a half wondering what the hell was happening in this amazing book. 🤦🏼♀️😂
Sixteen stole my entire fucking heart.
He’s so… broken. And sweet. And innocent. Which is certainly an interesting way to describe the literal Antichrist, huh? 😂 But he really is. And it made me want to take care of him just as much as Willow did.
“I’m a monster,” he whispers in protest.
“Then you’re my monster.”
😭😭😭
Willow was amazing, too, and I absolutely loved her, but man… Sixteen just completely stole the show for me. Watching her always see the humanity in him, despite everything she’d been told about what he was, absolutely got me.
“As monstrous as they were, there was such humanity in X-16’s eyes. Such sadness. And despite Barnes’s warnings, it didn’t make me want to run from him. It almost made me want to do the opposite.”
YES. 🥹
And can I just say…
THAT IS NOT HOW I EXPECTED HIS TRANSFORMATION SCENE TO GO. 🤭
But I sure as hell wasn’t mad about it. That’s all I’m saying because I refuse to spoil that shit for anyone else. 😂
This series continues to surprise me, make me fall in love with characters I absolutely did not expect to fall in love with, and somehow keep getting more unique with every book.
Skyla, I don't know what you’re putting in these books, but please keep doing it.
100/10 stars. I fucking loved this. 🖤
Skyla girl… we gotta get a drink or something. I consider you a homie at this point. 😂 I know I can always count on you for an EXCEPTIONAL read with this series. 🙂↕️
I’m not even lying when I say this series has quickly and easily become quite possibly my favorite series ever. I love the entire premise, the uniqueness is unmatched, and every single book manages to suck me in just as hard as the last. This one was absolutely no different.
I was hooked from the first word. I stayed up until 1 AM reading and finally told myself I had to go to sleep when I realized I still had an hour and a half left in the book. I SHOULD HAVE JUST STAYED UP AND FINISHED IT. Because what did I do instead? Lay in bed awake for the next hour and a half wondering what the hell was happening in this amazing book. 🤦🏼♀️😂
Sixteen stole my entire fucking heart.
He’s so… broken. And sweet. And innocent. Which is certainly an interesting way to describe the literal Antichrist, huh? 😂 But he really is. And it made me want to take care of him just as much as Willow did.
“I’m a monster,” he whispers in protest.
“Then you’re my monster.”
😭😭😭
Willow was amazing, too, and I absolutely loved her, but man… Sixteen just completely stole the show for me. Watching her always see the humanity in him, despite everything she’d been told about what he was, absolutely got me.
“As monstrous as they were, there was such humanity in X-16’s eyes. Such sadness. And despite Barnes’s warnings, it didn’t make me want to run from him. It almost made me want to do the opposite.”
YES. 🥹
And can I just say…
THAT IS NOT HOW I EXPECTED HIS TRANSFORMATION SCENE TO GO. 🤭
But I sure as hell wasn’t mad about it. That’s all I’m saying because I refuse to spoil that shit for anyone else. 😂
This series continues to surprise me, make me fall in love with characters I absolutely did not expect to fall in love with, and somehow keep getting more unique with every book.
Skyla, I don't know what you’re putting in these books, but please keep doing it.
100/10 stars. I fucking loved this. 🖤
May 26, 2026
This was a really unique set up! I will say that there’s a lot of religion, which I was iffy on, but it played out in a way I found satisfying. The romance was also a bit instalove, but the overall story had me gripped and quickly reading the pages to figure out where it was going!
*Thank you to the author for a free ARC in exchange for an honest review.
*Thank you to the author for a free ARC in exchange for an honest review.
May 8, 2026
Sadly, this onr was not for me.
I love this author so much, the writing was good and addictive as always, but I really coudn't connect with the story.
I didn't believe in the love story. It was much of an insta love, and I didn't like how the FMC sexualized the MMC while he was a patient. It felt weird and creepy, so I realllly couldn't connect with her.
I adored the MMC, but I'm not a fan of the choice the author made with the story line. It felt toxic, and we never really saw them connect beyond sexual tension on her part. It felt like she took huge advantage of his trauma, and that didn't sit right with me.
I love this author so much, the writing was good and addictive as always, but I really coudn't connect with the story.
I didn't believe in the love story. It was much of an insta love, and I didn't like how the FMC sexualized the MMC while he was a patient. It felt weird and creepy, so I realllly couldn't connect with her.
I adored the MMC, but I'm not a fan of the choice the author made with the story line. It felt toxic, and we never really saw them connect beyond sexual tension on her part. It felt like she took huge advantage of his trauma, and that didn't sit right with me.
May 2, 2026
She was meant to stop the apocalypse, not fall in love with it.
Willow has spent her life carrying survival like a debt she can never repay. A security job at a secret monster facility should be just another dangerous assignment, but the moment she sees Subject X-16, something in her recognizes him. He isn’t just a threat behind glass. He’s lonely, terrified, and changing into something no one knows how to stop.
Cain has been treated like a disaster waiting to happen, a body to contain, a power to sedate, and a name no one is allowed to ask for. His episodes can break people, but Willow is the one person who can stand near him without falling apart. The closer she gets, the harder it is to see him as the monster everyone fears, even as the signs start to look like the end she was raised to expect.
Their connection builds between compassion and danger, where trust becomes physical, command becomes comfort, and touch pulls him back from the edge. Willow wants to save him, but every answer circles the same brutal question: was she brought to him to love him, or to stop him?
Willow grows from a guarded survivor who thinks she has to earn her life into a woman who can choose desire and tenderness. Cain shifts from a nameless, self-loathing threat into a man who can accept touch, trust, identity, and love without reducing himself to what others fear. Their bond turns wary compassion into dangerous intimacy, built on surrender, protection, and seeing humanity where everyone else sees ruin.
An ultra-steamy paranormal monster romance with horror and romantic suspense at its core. It’s about survival guilt, religious trauma, trust after trauma, and choosing love and agency when fate has already named someone a monster. It’s tender, frightening, intimate, and built around a bond that turns inherited darkness into defiance.
The Elevator Pitch: A guarded survivor takes a job inside a secret monster facility and finds herself drawn to the one subject everyone fears most. He is gentle, dangerous, and unraveling into something prophecy-shaped, but her touch becomes the only thing that can call him back. As old cult wounds and end-of-the-world signs close around them, love becomes both the risk and the last possible mercy.
Heat Level: 🔥🔥🔥 Ultra-Steamy / Erotic Romance
Willow has spent her life carrying survival like a debt she can never repay. A security job at a secret monster facility should be just another dangerous assignment, but the moment she sees Subject X-16, something in her recognizes him. He isn’t just a threat behind glass. He’s lonely, terrified, and changing into something no one knows how to stop.
Cain has been treated like a disaster waiting to happen, a body to contain, a power to sedate, and a name no one is allowed to ask for. His episodes can break people, but Willow is the one person who can stand near him without falling apart. The closer she gets, the harder it is to see him as the monster everyone fears, even as the signs start to look like the end she was raised to expect.
Their connection builds between compassion and danger, where trust becomes physical, command becomes comfort, and touch pulls him back from the edge. Willow wants to save him, but every answer circles the same brutal question: was she brought to him to love him, or to stop him?
Willow grows from a guarded survivor who thinks she has to earn her life into a woman who can choose desire and tenderness. Cain shifts from a nameless, self-loathing threat into a man who can accept touch, trust, identity, and love without reducing himself to what others fear. Their bond turns wary compassion into dangerous intimacy, built on surrender, protection, and seeing humanity where everyone else sees ruin.
An ultra-steamy paranormal monster romance with horror and romantic suspense at its core. It’s about survival guilt, religious trauma, trust after trauma, and choosing love and agency when fate has already named someone a monster. It’s tender, frightening, intimate, and built around a bond that turns inherited darkness into defiance.
The Elevator Pitch: A guarded survivor takes a job inside a secret monster facility and finds herself drawn to the one subject everyone fears most. He is gentle, dangerous, and unraveling into something prophecy-shaped, but her touch becomes the only thing that can call him back. As old cult wounds and end-of-the-world signs close around them, love becomes both the risk and the last possible mercy.
Heat Level: 🔥🔥🔥 Ultra-Steamy / Erotic Romance
May 5, 2026
4.25 stars. This story is female lead POV, well written and edited, and a slowburn, sweet and steamy, contemporary fantasy romance between Willow, the female security guard lead, and the male monster lead withholding his name after having voluntarily interred himself in her research facility. I empathised with Willow’s historical trauma and appreciated the work she’d done to recognise it. I enjoyed her confidence in her capacity. I enjoyed her pride in being able to work with the male lead. I enjoyed seeing him open up to her. I enjoyed the building relationship, and Willow’s confidence in both what she wanted and that it was also what he wanted. I appreciated her calm under pressure, and I enjoyed the steamy, female led, intimate scenes. I enjoyed the ending, with both characters enjoying their relationship but still working out how to deal with the world.
I received a complimentary copy of this book and am voluntarily leaving a review.
I received a complimentary copy of this book and am voluntarily leaving a review.
October 15, 2026
I love this author but this book felt like a reverse age gap of a lady who takes advantage of a traumatized barely post teen 😒
September 30, 2026
⭐️ 3.5 ⭐️
𝙄𝙛 𝙄'𝙢 𝙜𝙤𝙞𝙣𝙜 𝙩𝙤 𝙙𝙞𝙚 𝙩𝙤𝙢𝙤𝙧𝙧𝙤𝙬, 𝙞 𝙬𝙖𝙣𝙩 𝙩𝙤 𝙙𝙞𝙚 𝙬𝙞𝙩𝙝 𝙩𝙝𝙚 𝙩𝙖𝙨𝙩𝙚 𝙤𝙛 𝙮𝙤𝙪 𝙤𝙣 𝙢𝙮 𝙡𝙞𝙥𝙨.
The story follows Willow, who gets hired as the head of security at MRF. Despite all the supernatural subjects being held there, there’s only one who really catches her attention: X-16.
When she finds out that X-16 has episodes that make it dangerous to even look at him through a security camera, she becomes even more curious. And around the same time, she discovers that she’s immune to him.
For me, one of the most beautiful moments was when they held each other’s hands for the first time:
“𝙄𝙨 𝙩𝙝𝙞𝙨 𝙨𝙩𝙧𝙖𝙣𝙜𝙚 𝙛𝙤𝙧 𝙮𝙤𝙪?” 𝙄 𝙖𝙨𝙠. 𝙈𝙮 𝙫𝙤𝙞𝙘𝙚 𝙞𝙨 𝙡𝙤𝙬; 𝙞𝙩 𝙛𝙚𝙚𝙡𝙨 𝙡𝙞𝙠𝙚 𝙩𝙝𝙞𝙨 𝙢𝙤𝙢𝙚𝙣𝙩 𝙨𝙝𝙤𝙪𝙡𝙙 𝙗𝙚 𝙝𝙪𝙨𝙝𝙚𝙙, 𝙨𝙤𝙢𝙚𝙝𝙤𝙬.
“𝙎𝙩𝙧𝙖𝙣𝙜𝙚?” 𝙃𝙞𝙨 𝙫𝙤𝙞𝙘𝙚 𝙞𝙨 𝙨𝙞𝙢𝙞𝙡𝙖𝙧𝙡𝙮 𝙦𝙪𝙞𝙚𝙩. “…𝙉𝙤. 𝙉𝙤𝙩 𝙖 𝙬𝙤𝙧𝙙 𝙄 𝙬𝙤𝙪𝙡𝙙 𝙪𝙨𝙚.”
“𝙒𝙝𝙖𝙩 𝙬𝙤𝙧𝙙 𝙬𝙤𝙪𝙡𝙙 𝙮𝙤𝙪 𝙪𝙨𝙚, 𝙩𝙝𝙚𝙣?”
"𝙄 𝙙𝙤𝙣'𝙩 𝙠𝙣𝙤𝙬," 𝙝𝙚 𝙨𝙖𝙮𝙨. "𝙄 𝙙𝙤𝙣'𝙩 𝙩𝙝𝙞𝙣𝙠 𝙄 𝙝𝙖𝙫𝙚 𝙖𝙣𝙮 𝙬𝙤𝙧𝙙𝙨 𝙩𝙤 𝙙𝙤 𝙞𝙩 𝙟𝙪𝙨𝙩𝙞𝙘𝙚."
And the fact that X-16 genuinely doesn’t want to hurt anyone, and that everything that happens to the people around him is actually beyond his control, makes Willow promise herself something:
𝙄 𝙬𝙖𝙣𝙩 𝙩𝙤 𝙨𝙖𝙫𝙚 𝙝𝙞𝙢, 𝙄 𝙩𝙚𝙡𝙡 𝙢𝙮𝙨𝙚𝙡𝙛. 𝙏𝙝𝙖𝙩'𝙨 𝙖𝙡𝙡 𝙄 𝙛𝙚𝙚𝙡, 𝙖𝙣𝙙 𝙩𝙝𝙚𝙧𝙚𝙨 𝙣𝙤𝙩𝙝𝙞𝙣𝙜 𝙬𝙧𝙤𝙣𝙜 𝙬𝙞𝙩𝙝 𝙩𝙝𝙖𝙩. 𝘽𝙪𝙩 𝙖𝙨 𝙄 𝙡𝙚𝙖𝙫𝙚 𝙩𝙝𝙚 𝙘𝙚𝙡𝙡, 𝙢𝙮 𝙝𝙖𝙣𝙙 𝙩𝙞𝙣𝙜𝙡𝙚𝙨 𝙬𝙞𝙩𝙝 𝙩𝙝𝙚 𝙢𝙚𝙢𝙤𝙧𝙮 𝙤𝙛 𝙝𝙞𝙨 𝙩𝙤𝙪𝙘𝙝.
When Sixteen apologizes to Willow for the way he looks, she only has one answer:
𝙉𝙤𝙩𝙝𝙞𝙣𝙜 𝙖𝙗𝙤𝙪𝙩 𝙮𝙤𝙪 𝙞𝙨 𝙜𝙧𝙤𝙨𝙨 𝙩𝙤 𝙢𝙚.
Sixteen tells her that because of her, he’s been able to get through his experiments more easily. And when Willow sees Sixteen smile for the first time, all she wants is to do something—anything—to make his pain a little easier to bear.
And she realizes that he’s worth it.
When Sixteen’s episodes keep getting worse, he asks Willow to kill him, because she’s the only person who’s immune to him. But making that decision is incredibly difficult for Willow:
𝘽𝙪𝙩 𝙬𝙝𝙚𝙣 𝙄 𝙨𝙚𝙚 𝙝𝙞𝙢 𝙨𝙢𝙞𝙡𝙚 𝙩𝙝𝙧𝙤𝙪𝙜𝙝 𝙩𝙝𝙚 𝙜𝙡𝙖𝙨𝙨, 𝙄 𝙝𝙖𝙫𝙚 𝙖 𝙩𝙚𝙧𝙧𝙞𝙗𝙡𝙚 𝙛𝙚𝙖𝙧 𝙩𝙝𝙖𝙩 𝙄 𝙢𝙖𝙮 𝙣𝙤𝙩 𝙗𝙚 𝙖𝙗𝙡𝙚 𝙩𝙤 𝙙𝙤 𝙬𝙝𝙖𝙩 𝙝𝙚 𝙖𝙨𝙠𝙨, 𝙣𝙤𝙩 𝙚𝙫𝙚𝙣 𝙞𝙛 𝙩𝙝𝙚 𝙚𝙣𝙩𝙞𝙧𝙚 𝙬𝙤𝙧𝙡𝙙 𝙞𝙨 𝙖𝙩 𝙨𝙩𝙖𝙠𝙚.
Willow agrees to consider his request on one condition: he has to give her something in return. And that something is his real name.
Cain.
Cain keeps insisting that she kill him, but Willow refuses every time.
“𝘿𝙤 𝙮𝙤𝙪 𝙩𝙝𝙞𝙣𝙠 𝙄 𝙬𝙖𝙣𝙩 𝙩𝙤 𝙙𝙞𝙚?”
𝙄 𝙨𝙩𝙖𝙧𝙚 𝙖𝙩 𝙝𝙞𝙢, 𝙨𝙥𝙚𝙚𝙘𝙝𝙡𝙚𝙨𝙨. 𝘽𝙚𝙘𝙖𝙪𝙨𝙚 𝙄'𝙢 𝙘𝙖𝙪𝙜𝙝𝙩 𝙤𝙛𝙛 𝙜𝙪𝙖𝙧𝙙, 𝙗𝙪𝙩
𝙖𝙡𝙨𝙤 𝙗𝙚𝙘𝙖𝙪𝙨𝙚 𝙄 𝙙𝙤𝙣'𝙩 𝙠𝙣𝙤𝙬 𝙩𝙝𝙚 𝙖𝙣𝙨𝙬𝙚𝙧 𝙩𝙤 𝙩𝙝𝙖𝙩 𝙦𝙪𝙚𝙖𝙩𝙞𝙤𝙣.
𝘾𝙖𝙞𝙣 𝙛𝙖𝙡𝙩𝙚𝙧𝙨. 𝙋𝙧𝙚𝙨𝙨𝙚𝙨 𝙖 𝙝𝙖𝙣𝙙 𝙩𝙤 𝙝𝙞𝙨 𝙛𝙖𝙘𝙚, 𝙘𝙤𝙫𝙚𝙧𝙞𝙣𝙜 𝙝𝙞𝙨 𝙚𝙮𝙚𝙨
“𝙄 𝙬𝙖𝙣𝙩 𝙩𝙤 𝙡𝙞𝙫𝙚," 𝙝𝙚 𝙨𝙖𝙮𝙨, 𝙝𝙞𝙨 𝙫𝙤𝙞𝙘𝙚 𝙨𝙝𝙖𝙠𝙮, 𝙦𝙪𝙞𝙚𝙩 𝙖𝙜𝙖𝙞𝙣. 𝙃𝙞𝙢𝙖𝙡 𝙖𝙜𝙖𝙞𝙣. "𝙀𝙨𝙥𝙚𝙘𝙞𝙖𝙡𝙡𝙮 𝙗𝙚𝙘𝙖𝙪𝙨𝙚 𝙞 𝙟𝙪𝙨𝙩- 𝙞 𝙟𝙪𝙨𝙩 𝙛𝙤𝙪𝙣𝙙 𝙮𝙤𝙪-"
But things don’t go well, and they’re forced to move Cain somewhere far away from the city, somewhere in the mountains, maybe. A place where the most dangerous subjects are kept.
But then everything goes wrong.
The two of them are taken hostage by the groups responsible for creating Cain as a demon, with the ultimate goal of bringing about the apocalypse.
Willow asks Cain to stop asking her to kill him. Cain agrees—not because he no longer wants to die, but because he knows they would kill Willow immediately afterward:
"𝙎𝙤 𝙮𝙤𝙪'𝙙 𝙨𝙖𝙘𝙧𝙞𝙛𝙞𝙘𝙚 𝙮𝙤𝙪𝙧𝙨𝙚𝙡𝙛 𝙩𝙤 𝙨𝙖𝙫𝙚 𝙩𝙝𝙚 𝙬𝙤𝙧𝙡𝙙, 𝙗𝙪𝙩 𝙮𝙤𝙪 𝙬𝙤𝙪𝙡𝙙𝙣'𝙩 𝙨𝙖𝙘𝙧𝙞𝙛𝙞𝙘𝙚 𝙢𝙚?" 𝘼𝙛𝙩𝙚𝙧 𝙖 𝙢𝙤𝙢𝙚𝙣𝙩, 𝙝𝙚 𝙨𝙞𝙢𝙥𝙡𝙮 𝙨𝙖𝙮𝙨, "𝙔𝙚𝙨." 𝙄 𝙡𝙚𝙩 𝙤𝙪𝙩 𝙖 𝙝𝙪𝙛𝙛 𝙩𝙝𝙖𝙩'𝙨 𝙣𝙤𝙩 𝙦𝙪𝙞𝙩𝙚 𝙖 𝙡𝙖𝙪𝙜𝙝. "𝙁𝙪𝙣𝙣𝙮, 𝙄 𝙛𝙚𝙚𝙡 𝙩𝙝𝙚 𝙨𝙖𝙢𝙚."
And in the end, when Willow is threatened and Cain completely transforms into a demon, there’s only one thing that can bring him back to his human self every time: Willow’s commands.
The truth is, I really loved this series. Reading the last two books was a genuinely good experience, but I have to say that the first two books were much more beautiful to me than the last two.
I loved the scenes where Cain’s ears and neck would turn red whenever he got embarrassed (I was practically throwing up rainbows 🥹🌈). And one of the cutest moments for me was when Willow was about to walk into his room, and he immediately jumped up and started making his bed.
Overall, I’m giving the series ⭐️⭐️⭐️⭐️.
April 30, 2026
🖤Fantasy romance - PNR
📿Monster romance
🖤Security guard x subject
📿Submissive monster
🖤Bound by fate
📿Cult survivor x harbinger of the apocalypse
🖤Spooky and spicy
📿Standalone in interconnected series
♥️♥️Huge thanks to Skyla Gray for selecting me to read this arc, it's an honor and privilege to me. All opinions are my own♥️♥️
MRF, or Melsbach Research Facility, specializes in the containment of creatures whose existence is not known to the outside world. Willow has just worked there and must face her haunting past again when she meets Subject X-16. Willow is the sole survivor of a cult's mass suicide that occurred 26 years ago, on the same day Subject X-16 was born. Subject X-16 has been sought and believed by the cult to be The Harbinger who can bring the end of the world. Subject X-16's mere presence can have a bad effect on those around him, without even touching—he can cause someone to feel unwell and his episodes can make people injure or kill themselves. but somehow Willow is immune to all of those effects, being the only one who can calm him down during his episodes. Day by day, his episodes become more dangerous, the transformation of X-16's body also progresses rapidly. then Willow determines to save him by looking into X-16's life and his connection to the cult that almost killed her.
I had a very good time with this book🥰 I don't even know what to say, I have no complaints. Willow and X-16 (or Cain), made such a beautiful couple😍 I loved them both so much and their interactions make the story even more interesting✨🥰
From page one I was hooked😍 the strange case of this subject X-16 kept me glued to the pages!🤩 the pacing is smooth, the plot didn't feel rushed and the dynamic between Willow and X-16 was truly a chef's kiss🥰 How Willow takes care of him professionally...how she calms him down when his episodes affect so badly the people around him, and how she keeps assuring him that he is not a monster that could lead to the end of the world like the cult believed🥰 I love how x-16 is so shy and obedient to Willow...it's sooo cute😍 this book was intensely absorbing and addictive, it leaves you wanting more😍 A must-read for monster romance lovers✨✨
📿Monster romance
🖤Security guard x subject
📿Submissive monster
🖤Bound by fate
📿Cult survivor x harbinger of the apocalypse
🖤Spooky and spicy
📿Standalone in interconnected series
♥️♥️Huge thanks to Skyla Gray for selecting me to read this arc, it's an honor and privilege to me. All opinions are my own♥️♥️
MRF, or Melsbach Research Facility, specializes in the containment of creatures whose existence is not known to the outside world. Willow has just worked there and must face her haunting past again when she meets Subject X-16. Willow is the sole survivor of a cult's mass suicide that occurred 26 years ago, on the same day Subject X-16 was born. Subject X-16 has been sought and believed by the cult to be The Harbinger who can bring the end of the world. Subject X-16's mere presence can have a bad effect on those around him, without even touching—he can cause someone to feel unwell and his episodes can make people injure or kill themselves. but somehow Willow is immune to all of those effects, being the only one who can calm him down during his episodes. Day by day, his episodes become more dangerous, the transformation of X-16's body also progresses rapidly. then Willow determines to save him by looking into X-16's life and his connection to the cult that almost killed her.
"I want to live," he says, his voice shaky, quiet again. Himself again. "Especially because I just—I just found you—"
I had a very good time with this book🥰 I don't even know what to say, I have no complaints. Willow and X-16 (or Cain), made such a beautiful couple😍 I loved them both so much and their interactions make the story even more interesting✨🥰
"I said you're my monster, and I meant it. It doesn't matter what form you take. You're mine."
From page one I was hooked😍 the strange case of this subject X-16 kept me glued to the pages!🤩 the pacing is smooth, the plot didn't feel rushed and the dynamic between Willow and X-16 was truly a chef's kiss🥰 How Willow takes care of him professionally...how she calms him down when his episodes affect so badly the people around him, and how she keeps assuring him that he is not a monster that could lead to the end of the world like the cult believed🥰 I love how x-16 is so shy and obedient to Willow...it's sooo cute😍 this book was intensely absorbing and addictive, it leaves you wanting more😍 A must-read for monster romance lovers✨✨
June 1, 2026
So first of all, spoiler alert, the apocalyptic monster is reduced to his human form by acts of intimacy from certain someone, he also needs commands and likes to obey. This is a fem-dom plot and it's slow burn. The suspense is balanced, the pace is good. The plot is well written and I quite enjoyed the story, I mean it's quite grim but also entertaining. The story twists and turns, it's rather wild. There are some highly enjoyable depictions of gore, at least to my taste, and yet some issues left me uncomfortable.
There's a lot of religious and culty, conspiracy themes in this novel for one. Some rejecting religious fundamentalism, some leaning heavily into magical thinking. What I didn't entirely get is the devil as a father figure part. The FML and MML could have easily been half-siblings, coming from the same sect whose leader was FML's biological father, yet the main characters didn't even consider that. That's just one example of the uncomfortable parts.
The FML in this one aims to satisfy her own unresolved psychological needs via being fixated on personally aiming to save another person at her work, as though doing so will redeem her, and also by heavy alcohol consumption. She carries a lot of trauma. Unfortunately, the person who she tries to fix is a suicidal patient with meltdowns and lethal mental health episodes who actively plans his suicide and tries to get the FML to do it, all the while the romantic line is pushed to the reader.
That combination was quite bad. Regrettably, going to work equaled for the FML just another opportunity to flirt and obsess over the MML, over whom she hold professional power. As with many romance novels, workplace and work itself was treated rather as a convenient excuse to throw characters together in intimate situations. The FML remains in denial much of the story, handing professional boundaries poorly. Much of her self-restraint equals to a passing moment of guilt: oh no, shouldn't be thinking like that, oh no, can't help it, oh no, compelled to harrass now my test subject, oh no.
Having said that, the dynamics in between the main pair were not only let-me-save-you vs. please-commit-my-suicide-for-me, there was genuine caretaking, yet on an ethically very shaky grounds. At least the horror elements were amusing though.
There's a lot of religious and culty, conspiracy themes in this novel for one. Some rejecting religious fundamentalism, some leaning heavily into magical thinking. What I didn't entirely get is the devil as a father figure part. The FML and MML could have easily been half-siblings, coming from the same sect whose leader was FML's biological father, yet the main characters didn't even consider that. That's just one example of the uncomfortable parts.
The FML in this one aims to satisfy her own unresolved psychological needs via being fixated on personally aiming to save another person at her work, as though doing so will redeem her, and also by heavy alcohol consumption. She carries a lot of trauma. Unfortunately, the person who she tries to fix is a suicidal patient with meltdowns and lethal mental health episodes who actively plans his suicide and tries to get the FML to do it, all the while the romantic line is pushed to the reader.
That combination was quite bad. Regrettably, going to work equaled for the FML just another opportunity to flirt and obsess over the MML, over whom she hold professional power. As with many romance novels, workplace and work itself was treated rather as a convenient excuse to throw characters together in intimate situations. The FML remains in denial much of the story, handing professional boundaries poorly. Much of her self-restraint equals to a passing moment of guilt: oh no, shouldn't be thinking like that, oh no, can't help it, oh no, compelled to harrass now my test subject, oh no.
Having said that, the dynamics in between the main pair were not only let-me-save-you vs. please-commit-my-suicide-for-me, there was genuine caretaking, yet on an ethically very shaky grounds. At least the horror elements were amusing though.
Review of advance copy received from Author
I genuinely don’t think I have the language for what this book did to me - but I’m going to try anyway.
I picked up The Harbinger’s Redemption this morning and did not come up for air until it was over.
Hours gone.
Brain chemistry altered.
If you’ve been reading Skyla Gray’s Monster Research Facility series, you already know she writes monsters like they ✨️feel✨️ - but this one? This one is different. This one claws under your skin and stays there.
Willow Hawkins walks into a desert facility built to cage the impossible - and immediately chooses not fear, not violence, but understanding.
Even when the lights go out.
Even when the shadows start moving.
Even when the very thing she craves in that place is designed to break her.
And then there’s Subject X-16.
Black Threat Level.
No name.
Three red eyes.
A voice that says “I didn’t mean to.” like he’s apologising for existing.
I’m not okay.
Because this isn’t just “monster romance.” This is watching a man who can make people destroy themselves grieve for hurting others. This is him having nightmares. This is him not being used to people telling him their names.
And Willow, God, Willow - looking at something the entire world fears and choosing softness anyway. Choosing to stay. Choosing him.
It’s teeth and terror and fluorescent-lit corridors and something ancient and wrong - and right in the middle of it, this quiet, devastating tenderness that hits so much harder than anything violent ever could.
The romance feels like standing too close to something dangerous and realising you don’t want to step back.
Watching Sixteen find even a moment of peace in Willow's presence? Watching her treat him like he’s person when everything else calls him a weapon?
I’m ruined.
This series has always been addictive, but this one feels like a turning point - sharper, darker, more intimate. Like the story itself is unravelling alongside him.
Willow and her Harbinger have permanently altered me, and I don’t think I want to recover.
I received an advance reader copy from the author and am sharing my honest review.
I picked up The Harbinger’s Redemption this morning and did not come up for air until it was over.
Hours gone.
Brain chemistry altered.
If you’ve been reading Skyla Gray’s Monster Research Facility series, you already know she writes monsters like they ✨️feel✨️ - but this one? This one is different. This one claws under your skin and stays there.
Willow Hawkins walks into a desert facility built to cage the impossible - and immediately chooses not fear, not violence, but understanding.
Even when the lights go out.
Even when the shadows start moving.
Even when the very thing she craves in that place is designed to break her.
And then there’s Subject X-16.
Black Threat Level.
No name.
Three red eyes.
A voice that says “I didn’t mean to.” like he’s apologising for existing.
I’m not okay.
Because this isn’t just “monster romance.” This is watching a man who can make people destroy themselves grieve for hurting others. This is him having nightmares. This is him not being used to people telling him their names.
And Willow, God, Willow - looking at something the entire world fears and choosing softness anyway. Choosing to stay. Choosing him.
It’s teeth and terror and fluorescent-lit corridors and something ancient and wrong - and right in the middle of it, this quiet, devastating tenderness that hits so much harder than anything violent ever could.
The romance feels like standing too close to something dangerous and realising you don’t want to step back.
Watching Sixteen find even a moment of peace in Willow's presence? Watching her treat him like he’s person when everything else calls him a weapon?
I’m ruined.
This series has always been addictive, but this one feels like a turning point - sharper, darker, more intimate. Like the story itself is unravelling alongside him.
Willow and her Harbinger have permanently altered me, and I don’t think I want to recover.
I received an advance reader copy from the author and am sharing my honest review.
May 21, 2026
Okay this was totally not what I was expecting, but I absolutely loved it! This was my first introduction to the author and the series, and it was seriously enticing.
The story had me completely hooked. Look, this one was out there for sure, but man did I ever enjoy it. The characters were phenomenal! The MMC was just so darn sweet and adorable. I really loved his character, how the author managed to take an absolute monster and turn him into a little guy, someone that the reader is totally rooting for. We LOVE a sub MMC. The MFC is badass and dominant, and man does she make a good argument for the "I can fix him" girls out there.
What I wasn't expecting when reading this was the subtle religious undertones, especially as the story and plot develops. I can't lie though, I think it added so much to the story. The idea of religious trauma being thickly woven into the plot made the whole setting so much more eerie, and I really felt that it was the main reason I got so sucked into the story to begin with. The worldbuilding and 'vibes' of this story were so well done, I was on edge the entire time reading, in the best possible way.
I can't lie, I would not go into this expecting the main focus to be romance. I feel as if the incredible plot itself takes more of a focus, with the mystery slowly being revealed as the book goes on. Trust me, I am normally a full romance girlie, and romance is normally what I want the main focus to be in a book, but man did this ever not need just romance to drive the plot! It definitely wasn't the greatest love story ever written, it was much more about the sexual tension between the characters then them actually getting to know and love each other, but I absolutely loved every second anyways.
Overall, I really thoroughly enjoyed this book - I read it all in one go, couldn't put it down! I would absolutely recommend for anyone looking for absolutely incredible storytelling, characters, and world building with their spice ;)
I received an advance review copy for free, and I am leaving this review voluntarily :)
The story had me completely hooked. Look, this one was out there for sure, but man did I ever enjoy it. The characters were phenomenal! The MMC was just so darn sweet and adorable. I really loved his character, how the author managed to take an absolute monster and turn him into a little guy, someone that the reader is totally rooting for. We LOVE a sub MMC. The MFC is badass and dominant, and man does she make a good argument for the "I can fix him" girls out there.
What I wasn't expecting when reading this was the subtle religious undertones, especially as the story and plot develops. I can't lie though, I think it added so much to the story. The idea of religious trauma being thickly woven into the plot made the whole setting so much more eerie, and I really felt that it was the main reason I got so sucked into the story to begin with. The worldbuilding and 'vibes' of this story were so well done, I was on edge the entire time reading, in the best possible way.
I can't lie, I would not go into this expecting the main focus to be romance. I feel as if the incredible plot itself takes more of a focus, with the mystery slowly being revealed as the book goes on. Trust me, I am normally a full romance girlie, and romance is normally what I want the main focus to be in a book, but man did this ever not need just romance to drive the plot! It definitely wasn't the greatest love story ever written, it was much more about the sexual tension between the characters then them actually getting to know and love each other, but I absolutely loved every second anyways.
Overall, I really thoroughly enjoyed this book - I read it all in one go, couldn't put it down! I would absolutely recommend for anyone looking for absolutely incredible storytelling, characters, and world building with their spice ;)
I received an advance review copy for free, and I am leaving this review voluntarily :)
Review of advance copy
Willow has been searching for meaning ever since she survived a doomsday cult as a child. She's worked security in many different situations, and she finds her new job at MRF surprisingly engaging. As the facility researches mysterious monsters and creatures of legends, X-16 seems a strange inhabitant of the facilities. He largely seems human with the exception of his continuing development of eyes and feathers, but he has a dangerous effect on anyone monitoring him. When Willow discovers she is naturally resistant to X-16's effects, she thinks she's finally found her purpose in life. But as X-16 continues to change, Willow starts to wonder if he's the apocalypse her cult prayed for.
As always, I enjoy returning to the Monster Research Facility series. I love how the research center has clearly changed to better serve the needs of the monsters it holds. X-16 is very dangerous, but is clearly a tragic character, as he has little control of the changes affecting him and he doesn't want to hurt anyone else. I also liked how Willow does her best to maintain her professionalism while still helping X-16 and meeting his emotional needs. Her history of religious trauma colors a lot of how she sees X-16 and herself. While she has clearly taken steps to help herself process her past, her healing is incomplete, making her a very realistic work in progress style character. She doesn't always make the right decisions, but her heart is a clear guiding force.
Another excellent edition to the series that emphasizes confronting one's past. Compared to other books in the series, this was a more slow burn, but it was still a fantastic read.
I received an advance review copy for free, and I am leaving this review voluntarily.
As always, I enjoy returning to the Monster Research Facility series. I love how the research center has clearly changed to better serve the needs of the monsters it holds. X-16 is very dangerous, but is clearly a tragic character, as he has little control of the changes affecting him and he doesn't want to hurt anyone else. I also liked how Willow does her best to maintain her professionalism while still helping X-16 and meeting his emotional needs. Her history of religious trauma colors a lot of how she sees X-16 and herself. While she has clearly taken steps to help herself process her past, her healing is incomplete, making her a very realistic work in progress style character. She doesn't always make the right decisions, but her heart is a clear guiding force.
Another excellent edition to the series that emphasizes confronting one's past. Compared to other books in the series, this was a more slow burn, but it was still a fantastic read.
I received an advance review copy for free, and I am leaving this review voluntarily.
Review of advance copy
Thank you to Skyla for sending me an arc copy of this book! I was so excited to read it! These are all my honest thoughts and opinions.
I love this series so much and am always so excited to read every addition to it. This particular book was a completely different vibe than the others in that it had a lot more religious elements, covered more about trauma from the past for both characters, and the FMC was the dominant one in their relationship (which I loved!).
I loved Willow’s personality, as it was very dimensional and she had different sides to her. Sixteen’s hesitancy and unsureness made their connection all the more sweeter! I really appreciated the different dynamic their relationship had, as it made so much sense for their characters and made for a (somewhat) slowburn. There was a lot of “comfort” trope in this book and it was so cute. I also loved the whole “only she can touch/be near him” aspect. So romantic!!
I also like how every book in this series does not just focus on romance, but also has an actual plot following the characters, and this one was no exception! I think it covered ideas that have not yet been introduced in the series and it made for an action packed ending.
I highly recommend reading this! I clearly enjoyed this considering I read it in one night/morning. I was addicted to finding out everything and seeing Willow and Sixteen officially get together.
Thank you again Skyla! I cannot wait for more of the series!!
I love this series so much and am always so excited to read every addition to it. This particular book was a completely different vibe than the others in that it had a lot more religious elements, covered more about trauma from the past for both characters, and the FMC was the dominant one in their relationship (which I loved!).
I loved Willow’s personality, as it was very dimensional and she had different sides to her. Sixteen’s hesitancy and unsureness made their connection all the more sweeter! I really appreciated the different dynamic their relationship had, as it made so much sense for their characters and made for a (somewhat) slowburn. There was a lot of “comfort” trope in this book and it was so cute. I also loved the whole “only she can touch/be near him” aspect. So romantic!!
I also like how every book in this series does not just focus on romance, but also has an actual plot following the characters, and this one was no exception! I think it covered ideas that have not yet been introduced in the series and it made for an action packed ending.
I highly recommend reading this! I clearly enjoyed this considering I read it in one night/morning. I was addicted to finding out everything and seeing Willow and Sixteen officially get together.
Thank you again Skyla! I cannot wait for more of the series!!
Review of advance copy received from Author
Skyla Gray writes interesting, weird, spooky, spicy books, and The Harbinger’s Redemption is no exception. Fourth in the Monster Research Facility series, I believe it can be read as a standalone, though it is a richer story knowing the history and universe Gray has created. I have read all 4 and feel this is an excellent installment in the series. I read it in day.
Easy to read, characters with history, depth, and growth, and more spooky than most romance books I come across. I do wish we had a chapter or two from MMC Sixteen’s point of view, but it doesn’t feel missing from the story.
Thanks to Skyla Gray I received an advance review copy for free, and I am leaving this review voluntarily.
Spoilers! Below are the tags I included in my personal tracking that other readers may find relevant: anal, Arizona, dark, dempn, fmc-willow, interseries, interspecies, mmc-sixteen, monster, slow burn, toys, virgin
Fiction, fantasy, romance, adventurous, emotional, mysterious, medium pace
Plot or Character Driven: plot
Strong character development: yes
Lovable characters: yes
Diverse cast of characters: complicated
Flaws of characters a main focus: yes
Prior reading required: no, but you totally should
Would you read it again: yes, when rereading the full series
Recommend to friends: yes, if they were looking for a spooky monster romance with religious or cult undertones
Meet Cute: He’s a subject at the facility she works security for
POV: first person, FMC
Easy to read, characters with history, depth, and growth, and more spooky than most romance books I come across. I do wish we had a chapter or two from MMC Sixteen’s point of view, but it doesn’t feel missing from the story.
Thanks to Skyla Gray I received an advance review copy for free, and I am leaving this review voluntarily.
Spoilers! Below are the tags I included in my personal tracking that other readers may find relevant: anal, Arizona, dark, dempn, fmc-willow, interseries, interspecies, mmc-sixteen, monster, slow burn, toys, virgin
Fiction, fantasy, romance, adventurous, emotional, mysterious, medium pace
Plot or Character Driven: plot
Strong character development: yes
Lovable characters: yes
Diverse cast of characters: complicated
Flaws of characters a main focus: yes
Prior reading required: no, but you totally should
Would you read it again: yes, when rereading the full series
Recommend to friends: yes, if they were looking for a spooky monster romance with religious or cult undertones
Meet Cute: He’s a subject at the facility she works security for
POV: first person, FMC
Review of advance copy received from Author
✨ ARC Review — Harbinger’s Redemption by Skyla Gray ✨
🪽 Spice: 2/5
💞 Longing: 5/5
🖤 Emotional tension: 5/5
✨ Overall: Absolutely addictive
I have not been this obsessed with a winged man since Patch Cipriano, and honestly, this book completely stole my heart. Skyla gave us a story filled with aching devotion, tender healing, and that irresistible "I would burn the world for you" kind of love.
The connection between these two feels so raw and intimate because it is not built only on attraction, it is built on need. The way they protect each other, soften for each other, and slowly become each other’s safe place was genuinely beautiful. There is a soft femdom/submissive undercurrent woven into their dynamic, and it made every interaction feel even more delicious.
One of my favorite parts was seeing the facility begin to feel less cold and cruel, almost as if even that world is learning how to love its monsters. And the fact that still lingers in this story made everything feel even sweeter for longtime readers of the series.
Skyla continues to prove that this series is pure magic, and I already know I will be counting the days until the next book 🖤📖✨
🪽 Spice: 2/5
💞 Longing: 5/5
🖤 Emotional tension: 5/5
✨ Overall: Absolutely addictive
I have not been this obsessed with a winged man since Patch Cipriano, and honestly, this book completely stole my heart. Skyla gave us a story filled with aching devotion, tender healing, and that irresistible "I would burn the world for you" kind of love.
The connection between these two feels so raw and intimate because it is not built only on attraction, it is built on need. The way they protect each other, soften for each other, and slowly become each other’s safe place was genuinely beautiful. There is a soft femdom/submissive undercurrent woven into their dynamic, and it made every interaction feel even more delicious.
One of my favorite parts was seeing the facility begin to feel less cold and cruel, almost as if even that world is learning how to love its monsters. And the fact that still lingers in this story made everything feel even sweeter for longtime readers of the series.
Skyla continues to prove that this series is pure magic, and I already know I will be counting the days until the next book 🖤📖✨
May 4, 2026
*4.5 stars*
I’m going to refer to the main MMC as X-16 to avoid spoilers! This was definitely a wild ride from start to finish. From Willow’s past with the cult, to X-16’s connection to her, to their undeniable connection, X-16’s struggle with his transformation to a crazy cult, I was invested in these two from the start. I loved the religious trauma and corrupt angelic form of X-16, it really tied to the two of them together. You couldn’t help but become borderline obsessed with X-16 just like Willow did. It was clear to see the kind, insecure, sweet boy underneath that had never experienced love from another person. I think the broken pieces of Willow called to him just as his pieces called to her.
There were definitely some gruesome moments and some very sad ones. This book definitely was the saddest so far in my opinion, my heart really hurt for them. But once they were finally able to connect, it was undeniable. The spice was right up my alley, with X-16 being very submissive and obedient. Willow was the one in charge during their scenes and I have no complaints about that. My one compliant would be the things that actually saved X-16 in the end. I wish they would have explained more about how *that* ended up fixing him? Other than that, I really enjoyed it, especially the epilogue *wink wink*.
I’m going to refer to the main MMC as X-16 to avoid spoilers! This was definitely a wild ride from start to finish. From Willow’s past with the cult, to X-16’s connection to her, to their undeniable connection, X-16’s struggle with his transformation to a crazy cult, I was invested in these two from the start. I loved the religious trauma and corrupt angelic form of X-16, it really tied to the two of them together. You couldn’t help but become borderline obsessed with X-16 just like Willow did. It was clear to see the kind, insecure, sweet boy underneath that had never experienced love from another person. I think the broken pieces of Willow called to him just as his pieces called to her.
There were definitely some gruesome moments and some very sad ones. This book definitely was the saddest so far in my opinion, my heart really hurt for them. But once they were finally able to connect, it was undeniable. The spice was right up my alley, with X-16 being very submissive and obedient. Willow was the one in charge during their scenes and I have no complaints about that. My one compliant would be the things that actually saved X-16 in the end. I wish they would have explained more about how *that* ended up fixing him? Other than that, I really enjoyed it, especially the epilogue *wink wink*.
May 22, 2026
This is a story of redemption between a girl with survivor's guilt from a religious cult and a young man at the MRF, trying to be good. Willow realizes that her past keeps her skeptical of forming relationships. As one of the newest guards at MRF, she learns of X-16, and her history may have worked out in her favor, because Willow can be in his presence with very minimal signs of physical hurt.
X-16, or Sixteen, is different from the other patients at MRF. His file, while thick, provides very little information on his monster nature. But he is changing and his episodes are becoming increasingly dangerous and powerful.
Willow and Sixteen slowly become friendly with each other, enough to share small talk. Their emotional growth is sweet to witness, and despite Sixteen's startling physical changes, you see his endearing nature and his desire to be of no harm to those around him. Theirs is a love story and there is a happy ending, but it takes a catastrophic event that is eerily of their shared history to reveal the commitment for each other and their determination of a future together.
Please be mindful of the triggers of this story. It is not necessary to read the prior three books, but you gain a better understanding of the MRF and secondary characters of this volume.
I received an advance review copy for free, and I am leaving this review voluntarily.
X-16, or Sixteen, is different from the other patients at MRF. His file, while thick, provides very little information on his monster nature. But he is changing and his episodes are becoming increasingly dangerous and powerful.
Willow and Sixteen slowly become friendly with each other, enough to share small talk. Their emotional growth is sweet to witness, and despite Sixteen's startling physical changes, you see his endearing nature and his desire to be of no harm to those around him. Theirs is a love story and there is a happy ending, but it takes a catastrophic event that is eerily of their shared history to reveal the commitment for each other and their determination of a future together.
Please be mindful of the triggers of this story. It is not necessary to read the prior three books, but you gain a better understanding of the MRF and secondary characters of this volume.
I received an advance review copy for free, and I am leaving this review voluntarily.
Review of advance copy
I was really excited to read another Monster Research Facility Book. <3
And I really enjoyed this installment as well. The FMC remained cool, (mostly) level-headed, and highly competent throughout the story. Her devotion to the MMC developed pretty fast, as the FMC was able to recognize his gentle nature right away and treated him, as well as other subjects, with respect at all times. I really liked that about the FMC.
However, I did feel that the MMC was often placed in uncomfortable or distressing situations, and by the end, I found myself wishing we could have seen him happy more often.
I liked the ending as it felt satisfying and like a fitting, logical conclusion to the story. Personally, I would have loved a bit more glimpses into the lives of both the FMC and MMC afterward, but I understand that every story has to come to an end at some point.
All in all, this was a very enjoyable read and a worthy addition to the Monster Research Facility series. Perhaps even my favorite so far. I’m definitely looking forward to future installments!
(I received an advance review copy for free, and I am leaving this review voluntarily.)
And I really enjoyed this installment as well. The FMC remained cool, (mostly) level-headed, and highly competent throughout the story. Her devotion to the MMC developed pretty fast, as the FMC was able to recognize his gentle nature right away and treated him, as well as other subjects, with respect at all times. I really liked that about the FMC.
However, I did feel that the MMC was often placed in uncomfortable or distressing situations, and by the end, I found myself wishing we could have seen him happy more often.
I liked the ending as it felt satisfying and like a fitting, logical conclusion to the story. Personally, I would have loved a bit more glimpses into the lives of both the FMC and MMC afterward, but I understand that every story has to come to an end at some point.
All in all, this was a very enjoyable read and a worthy addition to the Monster Research Facility series. Perhaps even my favorite so far. I’m definitely looking forward to future installments!
(I received an advance review copy for free, and I am leaving this review voluntarily.)
May 15, 2026
This paranormal romance stands out because of its unusual premise and the complicated dynamic between the main characters. The female lead works as security personnel in a research facility, while the male main character—a strange paranormal being who is harbinger angel—is being held there as a test subject.
Right from the beginning, there is a strong sense of tension surrounding him because he has a disturbing effect on nearly everyone around him, except for her. That immediately creates an interesting connection between them and raises a lot of questions about who he really is and why she is unaffected.
The relationship develops in a complicated environment filled with moral ambiguity, power imbalances, and secrecy, which gives the romance a darker and more suspenseful atmosphere. The story leans heavily into mystery and psychological tension alongside the romance.
Overall, this is an intriguing and unconventional paranormal romance with a unique setup and a relationship dynamic that keeps the story engaging throughout.
I received a free copy of this book via Booksprout and am voluntarily leaving a review.
Right from the beginning, there is a strong sense of tension surrounding him because he has a disturbing effect on nearly everyone around him, except for her. That immediately creates an interesting connection between them and raises a lot of questions about who he really is and why she is unaffected.
The relationship develops in a complicated environment filled with moral ambiguity, power imbalances, and secrecy, which gives the romance a darker and more suspenseful atmosphere. The story leans heavily into mystery and psychological tension alongside the romance.
Overall, this is an intriguing and unconventional paranormal romance with a unique setup and a relationship dynamic that keeps the story engaging throughout.
I received a free copy of this book via Booksprout and am voluntarily leaving a review.
August 19, 2026
Who knew that the only way to stop the anti-Christ and the end of days was a Dommy Mommy? lol. For real though, as someone with religious trauma in my past (not NEARLY as much as our main characters obviously), I related to this book in a way I didn’t expect to. I loved X-16 (won’t give away his real name). He was so sweet and pure. He didn’t understand what was happening to him, hated the thought of hurting people, and was willing to do anything to stop it from happening. I couldn’t help but want to jump into the pages and give him a hug.
Willow was looking for a fresh start and a purpose in life and she found one in X-16. When everyone else gives up, including himself, she refuses to let go of the hope that he can be saved, even if it means letting the world burn in the process.
It is a slow burn romance with little spice but the spice that’s there is spicy.🌶️🌶️🌶️ Their story ends in a happily ever after. This book is a part of a series but can be read as a stand alone. I’ve read them all (except for the first one because The Revenant’s Heart caught my eye first but I think I will go back and read it) and I recommend them all.
Willow was looking for a fresh start and a purpose in life and she found one in X-16. When everyone else gives up, including himself, she refuses to let go of the hope that he can be saved, even if it means letting the world burn in the process.
It is a slow burn romance with little spice but the spice that’s there is spicy.🌶️🌶️🌶️ Their story ends in a happily ever after. This book is a part of a series but can be read as a stand alone. I’ve read them all (except for the first one because The Revenant’s Heart caught my eye first but I think I will go back and read it) and I recommend them all.
November 8, 2026
I love this series sooo much and this book was no exception! Thoroughly enjoyed the cameos of other characters in the series.
Really loved the new dynamic we got in this book. Both Cain and Willow are highly intriguing characters. As usual, I was hooked in from the very first chapter.
I teared up multiple times reading this book, Cain’s story is absolutely heart wrenching.
Incredible spice, loved the slow burn romance and the horror elements.
Really my main issue with this book that I have with the rest of the series is how short it is. I want to know more about Willow’s life in the cult and the aftermath. I feel like there is so much to unpack here and we really only scrape the surface.
Also would have liked to know more about Cain’s upbringing and seen more on-page interactions showing the slow development of his bond with willow.
I feel like this book could be absolutely phenomenal with a higher page count and room to breathe.
That said, this was still a highly enjoyable read and I will continue recommending this series to anyone looking for a monster/paranormal romance.
Really loved the new dynamic we got in this book. Both Cain and Willow are highly intriguing characters. As usual, I was hooked in from the very first chapter.
I teared up multiple times reading this book, Cain’s story is absolutely heart wrenching.
Incredible spice, loved the slow burn romance and the horror elements.
Really my main issue with this book that I have with the rest of the series is how short it is. I want to know more about Willow’s life in the cult and the aftermath. I feel like there is so much to unpack here and we really only scrape the surface.
Also would have liked to know more about Cain’s upbringing and seen more on-page interactions showing the slow development of his bond with willow.
I feel like this book could be absolutely phenomenal with a higher page count and room to breathe.
That said, this was still a highly enjoyable read and I will continue recommending this series to anyone looking for a monster/paranormal romance.
May 23, 2026
I received an advance review copy for free, and I am leaving this review voluntarily.
The Harbinger's Redemption by Skyla Gray
This is the 4rd book in a series of monster romance.
I've only read the 3rd and 4rd until now, each one can be read as a standalone if you like.
well… the book was a slow burn for me which made sense with the context of our main characters, each one with their own traumas.
The spicy scenes were in a good timing, not rushed and felt more sensual than spice at least the first one. It was good not to have too many spice scenes with this couple.
Something I wish the book had was a few pov's of X-16 (Cain) not necessarily something extravagant but how he felt about Willow's proximity to him our him having flashbacks of his childhood to compare the of Willow's.
This is a good book to pass time if you want some light read and a monster romance. Thank you BookSirens.🤍
The Harbinger's Redemption by Skyla Gray
This is the 4rd book in a series of monster romance.
I've only read the 3rd and 4rd until now, each one can be read as a standalone if you like.
well… the book was a slow burn for me which made sense with the context of our main characters, each one with their own traumas.
The spicy scenes were in a good timing, not rushed and felt more sensual than spice at least the first one. It was good not to have too many spice scenes with this couple.
Something I wish the book had was a few pov's of X-16 (Cain) not necessarily something extravagant but how he felt about Willow's proximity to him our him having flashbacks of his childhood to compare the of Willow's.
This is a good book to pass time if you want some light read and a monster romance. Thank you BookSirens.🤍
May 27, 2026
The Harbinger’ s Redemption by Skyla Gray had a lot of emotional weight that really drew me in. I haven’t read many novels that mix horror with a super raw and vulnerable romance. My favorite aspect of the novel was Willow and Sixteen’s relationship. I really felt their connection because they were both battling trauma, fear, and identity. I felt like the body horror and apocalypse aspects gave the story more of a dark and thriller feel but the tender moments balanced out the characters and made them feel more human. I also enjoyed that Willow wasn’t written as this damsel in distress. She was strong and very much tried to protect herself. This allowed for more interest in the relationship between characters. The writing style gave off a sense of anxiety that you don’t often get which I felt fit the themes of fate, survival, and transformation. *There are some scenes that are very heavy readers might want to take caution due to content. *
Review of advance copy received from Author
Thank you to the author for the ARC. All opinions are my own.
3.5 stars. I went into this completely blind and was pleasantly surprised by how much I enjoyed it. The plot felt unique, kept my attention the whole way through, and the twists were genuinely unexpected while still adding to the story. I also liked that the romance wasn’t overly dominant for most of the book—the focus stayed on the bigger story, which worked really well for me.
My only real issue was near the end, when it felt like the story suddenly shifted focus to the physical side of the relationship. While the characters had chemistry, I didn’t feel like there had been enough buildup for that turn, so it came a bit out of nowhere.
Overall, I’m really glad I gave this one a chance, especially since it’s outside my usual genre.
3.5 stars. I went into this completely blind and was pleasantly surprised by how much I enjoyed it. The plot felt unique, kept my attention the whole way through, and the twists were genuinely unexpected while still adding to the story. I also liked that the romance wasn’t overly dominant for most of the book—the focus stayed on the bigger story, which worked really well for me.
My only real issue was near the end, when it felt like the story suddenly shifted focus to the physical side of the relationship. While the characters had chemistry, I didn’t feel like there had been enough buildup for that turn, so it came a bit out of nowhere.
Overall, I’m really glad I gave this one a chance, especially since it’s outside my usual genre.
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