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Shifters of the Three Rivers #6
The Relentless Mate
She’s the mark he should betray. He’s the temptation she can’t resist. A bond between them isn’t just dangerous - it could be fatal…
Annabella McGrath leads a covert crew of rebels hellbent on tearing down the Wolf Council. Half-witch, half-wolf, and totally off-limits, she’s carved out a life with no mate, no alpha, and no apologies. She doesn’t need anyone—especially not a too-charming operative with secrets behind his smile.
Sam Shaw is undercover, embedded deep in enemy territory. His mission is clear: get in, gather intel, and eliminate the threat. But Annabella isn’t just a threat—she’s a temptation, all heat and fire and sharp edges he shouldn’t want. The more time he spends in her orbit, the harder it is to remember which side he’s on.
Their chemistry sizzles under every sparring match, every late-night stare, every brush of skin. But they can’t escape the truth. And when secrets are revealed, all hell will break loose.
The Relentless Mate delivers a high-tension romance full of secret identities, enemies-to-lovers, found family, fated mates, and explosive consequences.
This is part one of Sam and Annabella’s story. It ends on a cliffhanger and does not have an HEA - their HEA is in The Resurgent Mate, Book 7.
Annabella McGrath leads a covert crew of rebels hellbent on tearing down the Wolf Council. Half-witch, half-wolf, and totally off-limits, she’s carved out a life with no mate, no alpha, and no apologies. She doesn’t need anyone—especially not a too-charming operative with secrets behind his smile.
Sam Shaw is undercover, embedded deep in enemy territory. His mission is clear: get in, gather intel, and eliminate the threat. But Annabella isn’t just a threat—she’s a temptation, all heat and fire and sharp edges he shouldn’t want. The more time he spends in her orbit, the harder it is to remember which side he’s on.
Their chemistry sizzles under every sparring match, every late-night stare, every brush of skin. But they can’t escape the truth. And when secrets are revealed, all hell will break loose.
The Relentless Mate delivers a high-tension romance full of secret identities, enemies-to-lovers, found family, fated mates, and explosive consequences.
This is part one of Sam and Annabella’s story. It ends on a cliffhanger and does not have an HEA - their HEA is in The Resurgent Mate, Book 7.
409 pages, Kindle Edition
Published July 3, 2025
82 people are currently reading
205 people want to read
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Displaying 1 - 8 of 8 reviews
July 4, 2025
Blurred lines and uncertainty
Sam is undercover as Felix and he has infiltrated Annabelle's group that have been systematically taking out council members. Get in and find out where they have been taking the members.
This book is fast paced and filled with conflicting details about who is doing what. This is because we are learning only what people have been told. Who is ultimately behind Ripple? What is the end goal?
Everything is starting to come together now and I think the connection between Sam and Annabelle is going to be important in the future.
I can't wait to see how this series finishes. I've loved every one's stories as well as the overall theme with the Ripple and Witches.
Sam is undercover as Felix and he has infiltrated Annabelle's group that have been systematically taking out council members. Get in and find out where they have been taking the members.
This book is fast paced and filled with conflicting details about who is doing what. This is because we are learning only what people have been told. Who is ultimately behind Ripple? What is the end goal?
Everything is starting to come together now and I think the connection between Sam and Annabelle is going to be important in the future.
I can't wait to see how this series finishes. I've loved every one's stories as well as the overall theme with the Ripple and Witches.
July 11, 2025
Ammabella's the mark that Sam knows he should betray. Sam's the temptation Annabella will never be able to resist. And the bond between them is beyond just dangerous – it could actually be fatal...
Annabella McGrath is the leader of a covert crew of rebels who are hellbent on tearing down the Wolf Council. Half-witch, Half-Wolf, and she's totally off-limits, Annabella has created her life without a mate, without an alpha, and she refuses to apologize for anything. Annabella has made it clear that she doesn't need anyone – especially this not-too-charming operative who has secrets behind his eye and his smile.
Sam Shaw has gone undercover, now he's embedded deep in the enemy territory. His mission has been made clear: get in, gather all the intel, and eliminate the threat. But, Sam learns that Annabella isn't just a threat – she's his ultimate temptation, she's all heat and fire, with sharp edges and he knows he shouldn't want her. And the more time that he spends with her and in her orbit, the harder it gets for Sam to remember what side he's supposed to be on.
With each sparring match, every late-night stare, every touch of their skin you can feel the chemistry between them sizzle. But, neither Sam nor Annabella can escape the truth. And when the secrets they are both hiding are finally revealed, all hell will break loose.
The Relentless Mate gives its readers a high-tension, high-stakes romance that's full of secret identities, enemies-to-lovers, found family, fated mates, and there are going to be explosive consequences in the end.
This is only part 1 of Sam and Annabella's story. This book does end on a cliffhanger and this book does not have an HEA – their HEA will be found in The Resurgent Mate, Book 7.
The Relentless Mate is the 6th book of Kira Nightengale's The Shifters of Three Rivers series. I have been in love with this series since the 1st book and I have been devouring each book the moment that I could get my hands on it. And this book was no different. I devoured it the second I got my hands on it and I loved each and every second of this book. I can't wait to get my hands on the next book.
Sam has gone undercover as Felix. He is so easy to fall in love with, he's kind, caring, and considerate. He's managed to infiltrate Annabella's group and as he's gotten to know Annabella he's found that his feelings and thoughts have changed. Now he's torn by his duty and the feelings that are growing between him and Annabella. He finds that he's unsure if he can follow through on what he's bound by duty to do as his feelings for Annabella are growing too strong.
Annabella, the leader of a covert crew of a group of rebels who are bound and determined to rip apart the Wolf Council. She's Half-witch, Half-Wolf. She's managed to create a life for herself with no mate, no alpha and she is completely unapologetic for anything that she says or does. She makes it clear that she needs no one in her life except her rebel group.
Annabella is strong, intelligent, brave, independent, courageous, resilient and she knows what she wants and what she's after. She's completely unapologetic for anything that she says or does. And she refuses to give up her independence for anyone.
Sam as Felix knows that his job is to get into Annabella's group and find out where they are taking the Council Members and what they are doing with them.
I am starting to see how all the threads of this series are starting to come together and the connection between Sam/Felix and Annabella is going to be really very important in the next book.
The Relentless Mate is such a fast-paced read and it's filled with so many conflicting details about who is doing what. And I am starting to realize that this is because we are starting to realize that we are only learning that we are only getting the information that everyone else has been told. Now we just need to know what is really behind Ripple? And what is the true end goal?
I am so excited to see how this series is going to end and I know that Kira Nightingale is going to knock the series finale out of the park. I've loved everyone's stories and some of them have made me laugh and others have made me cry. And keeping the overall theme of Witches and Ripple and now we start to see it all come together and see how it's all going to end is so exciting.
I have to recommend this book and this entire series. This is just a phenomenal series. And I can't wait to read the last book so I can go back and start reading it all over again. And you HAVE to read Kira Nightingale, she is such a talented author and you will enjoy each and every one of her books.
Annabella McGrath is the leader of a covert crew of rebels who are hellbent on tearing down the Wolf Council. Half-witch, Half-Wolf, and she's totally off-limits, Annabella has created her life without a mate, without an alpha, and she refuses to apologize for anything. Annabella has made it clear that she doesn't need anyone – especially this not-too-charming operative who has secrets behind his eye and his smile.
Sam Shaw has gone undercover, now he's embedded deep in the enemy territory. His mission has been made clear: get in, gather all the intel, and eliminate the threat. But, Sam learns that Annabella isn't just a threat – she's his ultimate temptation, she's all heat and fire, with sharp edges and he knows he shouldn't want her. And the more time that he spends with her and in her orbit, the harder it gets for Sam to remember what side he's supposed to be on.
With each sparring match, every late-night stare, every touch of their skin you can feel the chemistry between them sizzle. But, neither Sam nor Annabella can escape the truth. And when the secrets they are both hiding are finally revealed, all hell will break loose.
The Relentless Mate gives its readers a high-tension, high-stakes romance that's full of secret identities, enemies-to-lovers, found family, fated mates, and there are going to be explosive consequences in the end.
This is only part 1 of Sam and Annabella's story. This book does end on a cliffhanger and this book does not have an HEA – their HEA will be found in The Resurgent Mate, Book 7.
The Relentless Mate is the 6th book of Kira Nightengale's The Shifters of Three Rivers series. I have been in love with this series since the 1st book and I have been devouring each book the moment that I could get my hands on it. And this book was no different. I devoured it the second I got my hands on it and I loved each and every second of this book. I can't wait to get my hands on the next book.
Sam has gone undercover as Felix. He is so easy to fall in love with, he's kind, caring, and considerate. He's managed to infiltrate Annabella's group and as he's gotten to know Annabella he's found that his feelings and thoughts have changed. Now he's torn by his duty and the feelings that are growing between him and Annabella. He finds that he's unsure if he can follow through on what he's bound by duty to do as his feelings for Annabella are growing too strong.
Annabella, the leader of a covert crew of a group of rebels who are bound and determined to rip apart the Wolf Council. She's Half-witch, Half-Wolf. She's managed to create a life for herself with no mate, no alpha and she is completely unapologetic for anything that she says or does. She makes it clear that she needs no one in her life except her rebel group.
Annabella is strong, intelligent, brave, independent, courageous, resilient and she knows what she wants and what she's after. She's completely unapologetic for anything that she says or does. And she refuses to give up her independence for anyone.
Sam as Felix knows that his job is to get into Annabella's group and find out where they are taking the Council Members and what they are doing with them.
I am starting to see how all the threads of this series are starting to come together and the connection between Sam/Felix and Annabella is going to be really very important in the next book.
The Relentless Mate is such a fast-paced read and it's filled with so many conflicting details about who is doing what. And I am starting to realize that this is because we are starting to realize that we are only learning that we are only getting the information that everyone else has been told. Now we just need to know what is really behind Ripple? And what is the true end goal?
I am so excited to see how this series is going to end and I know that Kira Nightingale is going to knock the series finale out of the park. I've loved everyone's stories and some of them have made me laugh and others have made me cry. And keeping the overall theme of Witches and Ripple and now we start to see it all come together and see how it's all going to end is so exciting.
I have to recommend this book and this entire series. This is just a phenomenal series. And I can't wait to read the last book so I can go back and start reading it all over again. And you HAVE to read Kira Nightingale, she is such a talented author and you will enjoy each and every one of her books.
November 17, 2025
OMG!!! This book was absolutely amazing!!! Sam and Annabella’s flirty banter was the best thing ever. I read this with a fine tooth comb, wanting to see if I could manage to figure out if anyone on the FMC’s team might be lying. By the reveal, I was proud of myself, I was right. Miss Snooty did what I had expected.
Annabella might have been betrayed by some of her team, but, she still had real family that had stayed. I can see and understand her views on the council, paired with info that’s been fed to her while young. Her mistreatment growing up, the fear of being rejected by everyone. The need to be wanted and accepted.
Sam was able to help her with that, and now I need to know how this ends immediately! I usually avoid cliffhangers 🤣 because I can’t stand waiting. But I did it for Kira, and read it. This book kept me on the edge my seat; it made me laugh, it made giggle, had me curious, and even made me cry. That’s a great read in my opinion!
Highly recommend, give it a read!
Annabella might have been betrayed by some of her team, but, she still had real family that had stayed. I can see and understand her views on the council, paired with info that’s been fed to her while young. Her mistreatment growing up, the fear of being rejected by everyone. The need to be wanted and accepted.
Sam was able to help her with that, and now I need to know how this ends immediately! I usually avoid cliffhangers 🤣 because I can’t stand waiting. But I did it for Kira, and read it. This book kept me on the edge my seat; it made me laugh, it made giggle, had me curious, and even made me cry. That’s a great read in my opinion!
Highly recommend, give it a read!
July 20, 2025
I loved reading Sam’s book, his was the most anticipated read I’ve been looking forward to!
He’s part of the wolf council and has been tasked with going undercover to infiltrate a group that is going against the council. Here he meets his mate Annabella, who is strong willed and passionate about protecting people she cares about the most, Sam doesn’t realise she is his mate till later in the book but their chemistry throughout is strong.
I can’t wait for the next book to come and see how their story continues!
He’s part of the wolf council and has been tasked with going undercover to infiltrate a group that is going against the council. Here he meets his mate Annabella, who is strong willed and passionate about protecting people she cares about the most, Sam doesn’t realise she is his mate till later in the book but their chemistry throughout is strong.
I can’t wait for the next book to come and see how their story continues!
July 3, 2025
I’m the first to admit this story wasn’t my favorite. To much filler, it took to long to get to the meat of the story. That being said, the characters are well written and once things start clicking it gets much better. I can’t wait for the next book, when we get back to the babies and Three Rivers. Best read as a series and in chronological order. 4✨’s. I received an ARC from the Author and am choosing to leave this review.
July 8, 2025
This was one exciting read! I literally could not put this one down. Those last few chapters were filled edge of your seat thrills. My household chores definitely suffered today because this book totally absorbed my attention. I also really enjoyed seeing some outside perspectives about the Wolf Council. I absolutely cannot wait to see what happens next!!
July 9, 2025
DAYUM! That is all I can say about this book. I found myself HOOKED on Sam and Annabella. Like moths to flames 🔥. I cant wait for the next book to see what's next for them! The cliffhanger had me wishing the next book was already available!!!
July 5, 2025
I loved it.
It’s great to read Sam’s story and how he meets Annabella and see their chemistry slowly grow.
I can’t wait to see where Kira takes the next book. I don’t want this series to end.
It’s great to read Sam’s story and how he meets Annabella and see their chemistry slowly grow.
I can’t wait to see where Kira takes the next book. I don’t want this series to end.
Displaying 1 - 8 of 8 reviews