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Blood. Fury. Desire. That’s how our oath was made—and how it will be kept.

They say war changes people. I say it reveals them.

Over the past few months, I’ve watched the men I once called my captors become something else entirely—my fiercest allies, my deepest weakness, and the only ones I trust when everything goes to hell. They move like a unit, fight like wolves, and bleed like men who’ve been broken and rebuilt too many times.

And now they’re fighting for me. For us.

The search for Amorette is no longer just mine—it’s ours. We've cut off one head of the serpent, but the body still writhes, coiled tight around secrets none of us saw coming. When the call came for the fifth man in their fractured brotherhood, we didn’t hesitate. They’ve helped me search for my blood. Now it’s my turn to stand for theirs.

But with every answer, more questions rise. Loyalties shift. Lines blur. The deeper we dig, the more I realize this isn’t just about my sister anymore. This is about something bigger, darker—something that won’t let us go without a fight.

And still, they look at me like I’m theirs. Not a possession, not a hostage, but a woman who has carved her place beside them in fire and fury.

So when I set my plan into motion, they don’t stop me—they stand beside me. Armed. Ready. Unshakable.

I won’t lose my sister.

I won’t lose them.

And if I have to burn everything to the ground to protect the people I love—

Then let it burn.

*Please note this is a reverse harem and the author suggests you always read the foreword in her books. Contains some dark elements including trauma in the present day and the past, as well as mature situations, and is definitely intended for 18+ This is book FOUR of FIVE total.

300 pages, Kindle Edition

Published October 24, 2025

101 people are currently reading
183 people want to read

About the author

Heather Long

260 books2,283 followers
I love books. Not just a little bit, but a lot. Books were my best friends when I was growing up. Books didn’t care if I was new to a town or to a class. They were always there, my trustiest of companions. Until they turned on me and said I had to write them.

I can tell you that my own personal happily ever after included writing books. I’ve always said that an HEA is a work in progress. It’s true in my marriage, my friendships, and in my career. I am constantly nurturing my muse as we dive into new tales, new tropes, new characters and more.

After seventeen years back in Texas, we relocated to the Pacific Northwest in search of seasons, new experiences, and new geography. I can’t wait to discover what life (and my muse) have in store for me.

Maybe writing was always my destiny and romance my fate. After all, my grandmother wasn’t a fan of picture books and used to read me her Harlequin Romance novels.

Friends to lovers, enemies to lovers, friends to enemies to lovers, you name it, I love them and love to write them. I started with Earth Witches Aren’t Easy, the first in the Chance Monroe trilogy, but my characters and I have traveled a long way since I created that urban fantasy world.

One of the series I hear my readers recommend the most is the Untouchable series followed in quick succession by the Vandals, and that just delights me. No lie, whenever one of my readers brings up my wolves, I do a little a fist pump.

I’m active on social media, and I love hearing from readers. Feel free to tag me with a question about any of my books, or just say hi!

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5 stars
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96 (31%)
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Displaying 1 - 30 of 42 reviews
Profile Image for Cat H.
1,972 reviews219 followers
December 21, 2025
4.5 stars.
Ughhhh. I hate cliffhangers, especially when I have to wait for the next dang book.
Profile Image for The_Book_Brat.
943 reviews163 followers
October 25, 2025
*Reverse Harem
*Contemporary
*Multi-1st-PoV
*Kidnapping
*Abused FMC
*Band of Brothers
*Established Harem (4)
*Mid Burn
*4/5
Combat Gracie is ready 💪
Well Gracie certainly comes into her own in this book! 👑 she truly becomes on of the team when she’s actively involved in their plans and plays key roles to get the answers they need 💪
There is plenty of drama in this book with the kidnapping element; rescue; confrontation of Ams behalf …. It’s all going on for them! It doesn’t help that it appears the guys past is coming back for them with a vengeance in this penultimate book! I have a feeling both Gracie’s and their ‘big baddies’ are weaved together somehow - I like the mind games Heather may be playing 😳😄
It’s well paced and there’s a good amount of spice in this one and ooooo boy that group scene 🌶️🔥🌶️
That cliffhanger is absolutely throwing major danger vibes for our leading lady - I hope she gets all the answers she needs in the last book!
353 reviews7 followers
November 20, 2025
When we first met Grace in The Vandals, I knew her story was going to be something I was going to want to read and I'm so glad we have it. It is full of suspense, action, sass, present trauma, illegal trading of the human variety, missing family member, hot former military men and the goodest boy of them all, Goblin.

Grace has continued to assert herself as part of the team and I love that for her. She wants to help in any way she can to find her sister and I love that the guys aren't sidelining her, in the name of keeping her safe, just because she doesn't have the same level of training as them. I am enjoying the banter, the dynamic and of course the steamy chemistry between Grace, Bones, Voodoo, Lunchbox and Alphabet.

Now that we are down to the nitty gritty end of the series, I am not all ready for the final book but more than that, I am not ready to say goodbye but I need more. Please and thank you.
47 reviews
October 19, 2025
OMG what an awesome addition to this series....Oath was more then i thought it was going to be. I can't wait on the next in this series, to see how everything falls into place. It's awesome how Grace is growing with the guys, She is so much more then she first came out as. I'm glad to see how she is growing. Definitely worth the read. If this isn't on your TBR list is definitely should be.
Profile Image for Angela Denny.
1,054 reviews6 followers
November 18, 2025
Oh wow this book is a ride. So many twists and turns to the plot. Love how Grace is changing and gives as good as she gets. We finally get some answers in this book but many more questions. Some very nice spicy scenes and some nice action in this book. The ending was brutal and I need the next book to see how this all comes out.
Profile Image for Christi Goodwin.
Author 1 book3 followers
December 30, 2025
Book 4 does not dissapoint!

We get everything in this one! Fun antics, passion, and some answers! So thankful the last book is out to read!
Profile Image for E.
763 reviews3 followers
October 12, 2025
I literally want to scream!!!! What an ending, that book was exhilarating to read. The pace was fast, straight from one disaster to another. I'm glad boney boy is safe but now I need book 4 to see what happens next!
Profile Image for Jennifer G.
2,872 reviews54 followers
November 3, 2025
Grace never asked for any of this, but she's in deep now. Kidnapped and tortured, rescued but still held captive, in constant danger, and with her twin missing, Grace has developed a fight she never knew she was capable of. She's no longer a separate entity being protected; she's part of a close-knit group fighting as one. She's alongside her men in the battle for souls, and the search for her sister is now also theirs. Lives are on the line, and when one of their own is taken, they all work to get him home. Now maybe they can take the offensive. Or maybe it's all an illusion and they are still playing catch-up and, in more danger than ever.

Whew! Goodness, Doc, Miss Stephanie, Bones, O'Rourke, Amorette's boss, still no Amorette, and then... because of course... The blurb for this book could be summed up in one word - TENSION. Seriously, Heather Long does not want her readers to be able to breathe. She's more of an "on edge" kind of gal. This book was nonstop. Even the sexy times had to be squeezed in during lulls in danger. I loved it. I love how Grace has evolved. Not that she was ever fragile, but she is taking control now. No more sitting on the sidelines and waiting to be rescued; she's taken on an active role with her men. I love seeing a woman become a kickass heroine, especially when she looks like a pint-sized pixie. I also love the care this writer takes with trauma. Each of the men and Grace is carrying PTSD and residual trauma. Heather doesn't make it disappear, and she allows it to surface in different ways. I hesitate to know how she has such knowledge of trauma reactions and hope it's strictly from research, but as someone who works in BH, I appreciate so much that her characters don't suffer from horrific events in chapter 1 and are completely recovered by chapter 3. Her characters are real. They are gritty, messy, and bruised. They elevate her stories.

I need to discuss O'Rourke. I hated him. And then I didn't. Am I crazy, or does he fit in? He works well with the guys despite their history, and there's chemistry with Grace. Maybe he's meant for Amorette? I just feel like he's a part of their story now. And, of course, that ending. I get it, Heather couldn't help herself. She had to throw a grenade after pulling the pin. Now we get to see how far Grace has come. Fight, flight, freeze, or fawn? I think we will see 3 of the 4, if not all 4. She's not the same Pet he thinks he owns.
Profile Image for Vallene Boddington.
811 reviews35 followers
October 24, 2025
Oath by Heather Long penultimate book in Blood Brothers series.
⭐️⭐️⭐️⭐️⭐️🌶🌶🌶🌶💀💀💀
Yeah, Heather went and done it again. She's created a world filled with these impossible characters. You get so invested and bang things happen. You have a visceral reaction. Just want to hug and keep them safe.
We start off with Grace and the guys helping Doc with Emerson's problem (82nd Street Vandals). I love the crossovers. But soon they have to deal with their past. Things go amok and Bones is taken. Plan and execute a rescue with the help of an unlikely source. Back on track with finding Amorette, but it is not that easy... cliffhanger. Really, Heather...
Tropes:
Possessive MMC. Triggers. Touch-her-you-die. PTSD. Trauma bonding. Why choose. Doggy love. Chosen family. Age gap. Big and small. Only soft for her.
Quotes:
“Dollface,” I said. “I don’t have to try. You’ve got a temper—and you like losing it.”

All at once, he grabbed my biceps and hauled me up off my feet. His pitiless expression arrested every single thought I had as he glared at me and put his face right up to mine. “What would you do now?” Since he was asking… I kissed him.

“Survival is hard. Surviving is a little easier, but once you’ve survived, you have time to look back. To question. To wonder. To decide what you could have done, should have done maybe, or would have if you had known everything.”
Profile Image for Katelyn.
229 reviews5 followers
November 3, 2025
"And if I have to burn everything to the ground to protect the people I love— Then let it burn."

Book 4 in the Blood Brothers series continues to serve us with action packed highs and lows while pulling on your heartstrings in the best of ways. The search for Amorette continues as the group navigates through one situation after another. I absolutely loved the growth in the individual relationships between the characters as well as their growth as a whole group. It was great to see the guys letting Grace in and allowing her to take a bigger role in her own rescue operation. I love the dichotomy of Grace's character because she is so fierce and a complete force to be reckoned with around most, but when she is surrounded by her people she is also still vulnerable and fragile. The way that the guys all understand her emotional needs and meet her where she's at is also an incredible thing to see. The bond between the group only continues to strengthen in this book and I feel like they are more connected than ever at the end. Speaking of the end…. The cliff hanger queen once again leaves us screaming for more and wondering what will happen next in the final book of this incredible series! Heather NEVER disappoints and this book was no exception.
Profile Image for jamies_bookreads.
1,289 reviews19 followers
October 24, 2025
“And if I have to burn everything to the ground to protect the people I love⁠— Then let it burn.”

Oh Heather - That ending was just wrong 😑!!! Into the naughty author corner you go. 🤣

If you have not started this series yet - read no further and go do that now! You won’t be disappointed. Gracie and the guys are amazing.

I we were left with some serious questions in the last book. Well buckle up Heathens it’s going to be one action packed and spicy ride with Oath!!! Reading it I felt a range of emotions. The Prologue alone had me crying! Gracie gets some questions about her sister answered and about the guys’ past. The guys (Alphabet, Bones, Lunchbox, Voodoo) get to teach Gracie just how much she means to them and I’m here for it!!! However, to true Heather fashion just when we are getting ready for more answers the pages stop turning. I need the next book like I need air. I’m so addicted to this series.
Profile Image for iliana G.
1,695 reviews27 followers
October 25, 2025
I love the growth we get to see in each book!
In oath the search for Amorette continues and at the same time the past comes knocking down the boys doors.
I love the growth we see in each character. Grace learns and start to adapt to each one of them but at the same time we can see how all of them start to adapt to Grace as well.
There is definetely heat in this book and the spice lever is high.
There is action galore .
The author once more has used her unique type of writing in a way that it is impossible to escape the book. From the first page up to the last you are invested and you know that something is coming your way but you are unable to stop.
It is intoxicating to read!
Of course as always the cliffy at the end (a signature by now of the author) will leave you reeling and wanting for more and definetely leaves the author to the naughty author corner for a time out!
I truly can't wait for the next one!
Profile Image for katie.reads.romance.
272 reviews4 followers
October 26, 2025
Ooooft Heather you took me through the wringer here, I knew it was coming but okay let me start at the beginning.. reliving Miss Stephanie you know what through other perspective — instantly sobbing here.

Grace is just proving again and again she is not one to watch from the sidelines, “glass breaks Gracie, you don’t” is so true and in so many different ways for her strength.

Still loving each of the development with the guys, the scene at the beginning with Bones had me snorting, also totally caught the Sick Boys mention there and what an excellent choice, that series is thickkkk and would’ve left a bruise for sure.

And the ending, Heather I just know you’re in your corner cackling away, I had a feeling we’d end up here at some point and now I’m just praying the guys were super close and it’s a 2 second altercation for Grace.. a girl can dream right!? I’ll have to wait for Dare to find out..
Profile Image for Gale.
1,967 reviews22 followers
October 22, 2025
Although the search for Amorette continues, Grace and The Boys are continuing to have their own issues. Man, there are some crazy scenarios. But Grace is also working thru how she feels for all the guys which led to some really hawt scenes! It’s all tied in to the previous books so I can’t even begin to describe the story. Know that there are so many ups and downs…I know I’d never be able to deal. Through it all, though, Grace knows that the guys will always have her back, as she has theirs. The bond grows so much stronger in this book.

This story ends on a cliffhanger – and that cliff is about a thousand feet tall! – so it kept me on the edge of my seat AND cursing that I have to wait for the next book, as I’ve felt for all the previous ones. Loved It! And impatiently waiting...
1,012 reviews5 followers
November 19, 2025
I enjoyed this book a lot.

As an FMC, Grace is likeable, well-developed, and shows growth over every book. Her motivations are understandable and heartbreaking.

There were fewer operations in this book, but I really enjoyed the museum caper.

This would've been four stars, but I realized that the MMCs are little more than cardboard cut-outs.
Bones is the controlling guy who carries everything on his shoulders, Alphabet is the tech guy with a war injury and a dog, Lunchbox is the nurturing guy who likes explosions, and Voodoo is the sexy guy who likes to shop. That's their entire personalities. Did they exist before joining the military? Do they have parents? Siblings? Where are they from? What were their past relationships like? We still don't even know Alphabet's real name. After four books.
Profile Image for Susan .
1,034 reviews
October 27, 2025
ʙᴏᴏᴋ ʀᴇᴠɪᴇᴡ 📖: Oath: Blood Brothers #4 by Heather Long

I felt like we solidified the bonds between Gracie with all the guys in Oath. That she has slide in to become apart of their unit. We had all the suspense and still the mystery getting to her sister along with all the other treats still lurking for them. Cliffhanger of course but I honesty didn’t expect this one the way it was.

Looking forward to the finally book for Grace Bones, Voodoo, Alphabet and Lunchbox.

I really hope that we will have a reunion between the sisters of some kind since we didn’t get that in Am’s ending.

Possessive MMC | Touch Her & Die | PTSD | Trauma Bonding | Why choose MFMMM | Dog Daddy| Chosen family | Age Gap | Soft For Only Her | Disability Rep | Former Military | Cliffhanger | Forehead Kiss
Profile Image for Shauni.
572 reviews
October 27, 2025
Didn’t want it to end! I need the last book!

Speechless. Utterly speechless.

I can’t believe you’ve left us on this ending, I never wanted it to end. I kept glancing towards the percentage part dreading getting closer to the 100 mark but not being able to stop/slow down. I devoured this book, I lived and breathed it until the very last word. I love Gracie and how fierce she was in this book. I love seeing the other bits into what happened to Amorette (it’s made me want to read her story all over again). Oh my, I loved Bones in this book, but I do love them all. I loved everything she shared with them in this book whether it was the lightheartedness, the heat or action packed adventures. This book was incredible and I can’t wait for the next one.
Profile Image for Mimi.Reads.Smut.
606 reviews63 followers
December 6, 2025
This picks up where Own left off and is basically a nonstop party of revelations, twists, and action (including the spicy kind).

I loooove seeing the relationships grow as the story develops. Gracie really comes into her own as she helps bring down the baddies. We get some more cameos from the vandals in this one, as well as more about the history of the guys and Doc. There are a lot of emotional moments while Gracie continues to search for her sister and find answers. Some heartbreaking but necessary conversations about trauma and healing occur, hopefully setting Gracie onto a path of recovery from the worst of her experiences.

The next book is the last one and I’m excited to see how they resolve it all!
Profile Image for Jemma Newby.
1,698 reviews10 followers
October 24, 2025
OMG , Noooo. It can't end like that , I need to know what is going to happen now. Once again I was completely hooked on this book. Grace and her guys were just incredible. I love how they're so protective and possessive over her but in this book they also encouraged her to shine. This book had me swooning throughout , I just love all the guys and couldn't pick a favourite. This book was action-packed and filled with plenty of steam and boy was it HOT. With that ending I am desperately waiting for the next book , OMG this author definitely knows how to write a cliffhanger. Phenomenal five star read that I would definitely recommend , it's just incredible.
Profile Image for Stacy Gragg.
154 reviews
October 24, 2025
Can we talk about that book cover first? I mean HELLO! 😍

Ok, now that I got that off my chest lets talk about what happened in Oath.
Oath opens the day of Miss Stephanie's funeral (we met Stephanie in the Vandals series, she is Doc's older sister) Gracie and the guys came to help when Doc called. Afterwards the search for Gracie's sister continues. So much more happens, an ambush, lots of explosions, Bones gets kidnapped and tortured and Grace, Voodoo, Alphabet and Lunchbox get some very steamy scenes.
Be prepared for A cliffhanger that will leave you reeling and wanting to curse out Heather Long until you get the last book of the series. Excellent read as always!
112 reviews
October 27, 2025
HOW DARE YOU END ON THAT CLIFFHANGER AND MAKE ME WAIT UNTIL DECEMBER FOR THE NEXT ONE!

I read the first three in this series months ago, so I was a little confused in parts, but I will reread just for fun because I love them.

I don’t remember Grace being annoying in the first three books, but in the beginning of this book, she was almost insufferable. She did get better throughout.

I LOVE THESE GUYS! Ugh they are all so different, yet so alike. I love everything about them all. I cannot wait to find out Alphabet’s real name. And can’t forget Goblin!

PS thank you for saying in the beginning that the dog didn’t die. That’s always a big worry when there is a dog and violence involved.
Profile Image for Amber.
1,370 reviews9 followers
October 29, 2025
"You will never be alone on this quest. We will be with you every step of the way."

Oath is the fourth book in the Blood Brothers series by Heather Long. This book is action-packed and had some unexpected twists that I enjoyed. This book does have some scenes that overlap with the Vandals series, but you do not have to read that series to enjoy this series.

I like Grace and I am glad that she continues to push the guys to read her in on everything that is going on. I absolutely love Alphabet, Bones, Lunchbox, and Voodoo! I don't think I will ever get enough of them.

This book does end in a cliffhanger so be prepared going in.
Profile Image for Samantha Hickey.
1,965 reviews47 followers
December 17, 2025
This series has me by the throat and I won't let it let go 😂

Oath is book 4 in the Blood Brothers series. This is a dark why choose romance. Make sure to read the foreword!

We are back with Grace and the guys and what a wild ride Heather takes us on! There are twists, and yes you get some of your answers you have been wanting but you will still have questions, and you will stay on the edge of your seat the whole way thru the book.

That cliffhanger will leave you BEGGING for the next book and I cant wait to read it and see what Heather is gonna put me thru next 😂

This series is EVERYTHING and you NEED to go read it right now!!!
Profile Image for Daphnne.
1,312 reviews8 followers
October 25, 2025
Action that keeps you on the edge of your seat!

This book gave me severe anxiety! The action, the taken, the rescue, the confrontation and that ending?! Mic drop...it was too goid to put down. I had to know what happened next and my nails did not survive. In the middle of all of that there was a group scene that had me reaching for my ice water and the training had me cackling. This series is just so captivating and I can't wait for the next book!
Profile Image for Vix.
191 reviews10 followers
October 25, 2025
4.5/5

i love this series and love the guys, especially bones.

i guess i think this one lacked something even more emotional with bones and grace.

i wanted to see her caring for him while he was literally dying but this was glossed over imo 😔 i get he’s a strong and capable mercenary but the guy was fucked up and in a week he’s ok?

anyway. i still devoured this and i liked the banter, o’rourke and that ending, which is why i’m giving this a 4.5 instead of a 4.
Profile Image for Meg Elle.
487 reviews8 followers
November 10, 2025
This is the penultimate book in the blood Brothers series. And it didn't disappoint. Keeps you glued from beginning to end. Leaving me really excited for the last book. Which I think is the perfect number. Really enjoying the storylines and the characters. Heather long has such a distinct voice in her writing that I'm such a fan of. I definitely highly recommend checking out this suspenseful, dark, why choose series.
Profile Image for Teresa Juckett (Love Dark Reads) .
2,510 reviews44 followers
December 20, 2025
As the clock is ticking down to the final book will Grace and the guy's get the answer of where Amorette is, but now they have to go help a brother, and Grace knows that the guy's have done everything to help her, so she's got a plan that will have them locked and loaded as they go to help, because that's what you do for the people you love. I'm so ready and not so ready to let these character's go, especially Goblin.
Profile Image for Kimberly Garner.
1,337 reviews29 followers
October 21, 2025
I’m going to be sad when this series is over. This book was action packed, yet still steamy. We see the characters fight for each other and themselves in more way than one way. Heather keeps her readers on the edge of their seats, and keeps us flipping pages if not tables. The cliff hangers. Need I say more?! Told in multiple pov and gripping this is a great addition to the series.
Profile Image for Lorrie.
2,270 reviews28 followers
October 28, 2025
Amorette and O’Rourke, am I right?? That’s my theory. Love this series. I was lmao towards the end when the guys were “testing” Grace. AB and Bones are still my favorites. Glad Grace calls Lunchbox Legend now. Love Goblin. Can’t wait for the last book to see how everything ends, especially with that major cliffhanger…
This entire review has been hidden because of spoilers.
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