Another solid 4 star psychological thriller from Leah Mercer! She never disappoints.

Ava dotes on her 11 year old daughter Lexi, she is Ava’s life, however Lexi feels stifled by her mother’s constant attention. She gets on a lot better with her dad, Dan, but he isn’t home often as he travels a lot for his pharmaceutical work. The family live in a safe quiet affluent neighbourhood but when there is a burglary at the house next to theirs, and Dan is still away for work, Ava is shaken, and Lexi feels extremely unsafe. The morning after the burglary Ava runs into her old friend Emily and her daughter Sophie, whilst doing the school run with Lexi. Both Ava and Emily had been pregnant with their daughters at the same time and after meeting at an antenatal clinic 11 years ago they instantly formed a close bond, but this bond was broken in a spectacular fashion soon after the two baby girls were born and since then both Ava and Emily just tend to say “hi” to each other at the school gates. Whilst Ava and Dan are comfortably well off, Emily isn’t, especially with Sophie’s father not being around, so she is anxious to make a better life for her and Sophie and is desperate for money. The morning after the burglary Ava runs into Emily and Ava, feeling very vulnerable and alone, she confides in Emily about the burglary and Lexi’s unwillingness to go back home due to feeling unsafe. Emily offers Ava and Lexi to stay with her and her daughter, Sophie, but her one bedroom flat is far too small for the four of them. So instead, Ava asks whether they could do a house swap for a few days until Dan gets back from his work trip and Emily agrees. Emily is excited to swap her tiny flat for Ava’s lovely large house and also hopes they may be able to rekindle the close friendship they once had and reconnect. Emily will do anything to get Ava’s friendship back; however, Emily and Sophie are a link to Ava’s past….. a past she is desperate to forget and pretend never happened. How far will Emily go to reconnect with Ava and when will Ava discover that Emily isn’t all who she seems to be?!

This was my second book by Leah Mercer, and I was hooked pretty early on as with her first book. I loved hearing the story from Ava, Emily and Lexi, dual POV’s are always something I enjoy. I was shocked at how grown up Lexi’s thinking was though; she seemed much older than an 11 year old but I think children grow up a lot quicker nowadays than they used to before there was so much technology around. I also was a bit baffled by Lexi’s anger towards her mum, although I do understand this could have been because she saw how independent Sophie was and she wanted the same independence, without realising that Sophie actually wanted her mum to be a mother to her rather than working every hour she could and leaving her alone so often. Chapter 25 shocked me to the core and the incident that occurred (again sorry for the mystery but this is a no spoiler review), made me realise very quickly who I should be rooting for and who was a pretty despicable character. I did not see the twist coming, which was brilliant, and I really was absolutely shocked at the turn of events, so excellent writing Leah Mercer!

This was a great story but a hard review to write as I don’t want to give away any spoilers, I hope I have done a decent job!

Overall, I would definitely recommend this to anyone who enjoys a good psychological thriller. Leah Mercer always comes up with the best (although sometimes chilling) twists! I look forward to what she writes next.

Thank you to NetGalley, Leah Mercer and Bookouture for my advanced reading copy. Out now.

What's Mine is Yours is my fourth venture into a book by Mercer and my favourite of hers to date.

The story is narrated from three POV, former best friends, Emily and Ava, and Ava's daughter Lexi.

It starts off at a moderate pace and with each chapter I read it amped up a notch as I neared the big reveal. I couldn't turn the pages fast enough!

The plot had me hooked and I was on tenterhooks waiting for those secrets to be outed, weren't you?

Suspenseful, tense and thoroughly enjoyable.

Goodness me, this was such a good book. Highly entertaining. Would definitely recommend to others, that's for sure!

Ava and Emily reconnect after a break in at Ava’s neighbor’s house. Once the best of friends, their friendship did not survive. They come up with an interesting plan. As Ava’s daughter Lexi is now terrified to be at her home, Ava and Emily agree to swap houses for a time. This is when things really become interesting.

Emily has an ulterior motive when it comes to the agreeing to swap houses. What she wants is the friendship between her and Ava to be restored, and will go to any extreme possible to make that happen. As it turns out, one or both of the women have secrets that soon are accompanied by danger if not shockingly poor decisions.

Told in alternating perspectives, this captivating story slowly weaves events from the past to the present. Leah Mercer’s masterful storytelling keeps the reader engaged from beginning to end, drawing them into the unfolding drama. This domestic thriller is a must-read, an absolute delight that will leave you eager to discover what happens next.

Many thanks to Bookouture and to NetGalley for this ARC for review. This is my honest opinion.

Emily offers to swap houses with her old best friend Ava, due to a burglary next door, who are no longer as close as she hopes they would be. Once there Emily begins to understand why Ava is avoiding her and the secrets she has could ruin the idyllic life that she has created.

I enjoyed the premise of this one and was interested to see where it would go. I was drawn into the story fairly soon into the novel, however it became quite slow paced until it picked up again at the end. I liked the dark undertones running throughout the story and the different points of view kept it engaging. I never really knew who to trust and there are some surprise twists to discover. This was a quick, easy read overall and an entertaining thriller. Thanks to NetGalley and the publisher for this copy in return for an honest review.

This is a darkly suspenseful novel with plenty of secrets hidden within its pages! I was intrigued by the relationship between the main characters of this book-Ava and Emily-who met when they were pregnant but nowadays no longer have the close friendship that they previously shared. But when Ava and Lexi feel unsafe in their home after a neighbour is violently burgled, Emily uses the crime to get back into Ava’s life…and her home.

I loved the alternative POVs in this book and trying to discover who had the most shocking secrets between Ava and Emily but the dynamics between their daughters were also very intriguing! Two very different mothers bringing up two very different daughters but still managing to maintain an air of mystery about their pasts. So lots of strong female characters here and you couldn’t trust a single one!

There were definitely some shocking secrets being keep here and whilst some of them were easy to uncover there were a few gasp out loud moments too! I thought I had all bases covered but was completely bowled over by some of the revelations towards the end that turned everything I had believed before on its head! Female friendships are notoriously difficult to navigate at times and the author uses her plot points to examine these important relationships that are often based on nothing more than giving birth at the same time.

A new author to me but one I will definitely return to in the future.

What's Mine Is Yours by Leah Mercer

This is one of the craziest and wildest thrillers I have recently read. Fast paced and the outstanding storysetting.

Two old friends with two secrets that both were trying to bring to the grave. Until the lately burglary happened, Ava's daughter was worried about it. Ava's old friend Emily suggested to swap house and now they were getting closer to the secrets.

I could not believe my eyes to read the ending. The high level of twisty and suspenseful vibe brilliantly created by the author Leah Mercer. This is definitely a page-turner.

Many thanks to Netgalley, Bookouture and the author for my copy.

Pub date: May 8 2025

"She invited her into her home. She shouldn't have..."

What's Mine is Yours by Leah Mercer is a suspenseful psychological thriller that explores friendship, rivalry, and obsession.

Ava and Emily used to be friends when they were both pregnant with their daughters. But faced with an unimaginable tragedy, Ava began to distance herself away from not only Emily, but away from everyone. Now years later a burglary next door has Ava and her daughter Lexi fearful to be home alone while husband Dan is away for work often. Emily sees this as her chance to reintegrate herself and her daughter Sophie into Ava's life. Offering up a solution in the form of a house swap until Dan can come home, Emily is hopeful that once she can get back into Ava's good graces the two can pick up their friendship. But both Ava and Emily are hiding secrets, and Emily is willing to sacrifice anything to be by Ava's side once again.

This is the second book by Leah Mercer that I have read and she is quickly becoming a must read author for me!! I loved the premise and found it to be full of insight into the reasons why the friendship had floundered in the first place. Emily's POV is truly wild and says a lot about how her mind works and the depths of obsession and rivalry with Ava that she has come to. The story is fast-paced with just enough action and suspense to keep me engaged. The chapters alternate between Ava, Emily and Ava's daughter Lexi and I liked how the secrets were revealed piece by piece. At one point I was 100% sure I knew where this was going only to be thrown in a different direction. Highly recommend!!

Thank you to NetGalley, Leah Mercer, and Bookouture for this ARC!! Publication date is May 8th 2025.

WHOA!!!! What a ride!!! This book was excellent!! I couldn’t put it down. Just when I thought I had it figured out a new twist was thrown in. I HIGHLY recommend this book!

Right away my mind was ruminating on why Ava felt the need to stay boxes up in her house and isolate herself from her husband, obsessing over her daughter. I also wondered why Emily was clingy and desperate to get back into Ava’s life.
Mercer made me wait for the stories to unfurl and I was astonished at one of the character’s duplicitous nature. I thought that person couldn’t stoop any lower until a revelation is revealed that left me cold.
It’s a great thriller and a reminder that we can’t shut out the past nor try to atone for sins by correcting a current wrong.

Name :- What's Mine Is Yours
Author:- Leah Mercer
Genre:- Psychological Thriller
In What’s Mine Is Yours, Leah Mercer masterfully spins a suspenseful web of psychological tension and twisted loyalty. What begins as a thoughtful gesture—a house swap between two old friends—quickly spirals into a disturbing game of manipulation, mistrust, and dark secrets. Emily sees her offer to swap homes as a chance to reconnect with her estranged best friend Ava. But once inside Ava’s seemingly perfect life, Emily realizes things aren’t as idyllic as they appear. The house holds secrets, and Ava’s carefully curated facade begins to crack. Meanwhile, Ava, trapped in Emily’s modest apartment, becomes increasingly paranoid. What is Emily really doing in her home? Does she know about the locked room—the one that hides a truth Ava thought she'd buried forever? Mercer crafts both characters with layered complexity. Emily is driven by unresolved resentment, while Ava is haunted by guilt and fear. Their inner thoughts unravel the narrative with mounting dread, leading to a shocking climax that challenges everything the reader thinks they know.
Likes and Dislikes :-
Likes:-
1 Dual POV storytelling that keeps you guessing who to trust.
2 Atmospheric and claustrophobic—the house becomes a character in itself.
3 Themes of guilt, betrayal, and obsession play out in gripping psychological detail.
Overall, What’s Mine Is Yours is a taut and riveting domestic thriller that explores the fragile line between friendship and rivalry. Leah Mercer delivers a slow-burn mystery full of sinister surprises and a final twist you won’t see coming.
My Rating :- 5/5.

I enjoyed this thriller. I thought the premise and storyline were unique and interesting. I liked the authors style of writing. I have not read from this author previously, so I will definitely have her on my radar from now on. I thought this was a great thriller that reads fast and can be read pretty quickly.

Two families, both with secrets, are the main characters in this story. As their lives start to unravel, the truth is revealed and will change the trajectory for both families. This was a slow-paced domestic thriller with a couple of twists. It dragged at times, but was an overall good read.

Thanks to #NetGalley and #Bookouture for the book #WhatsMineIsYours by #LeahMercer. This book is such a wild ride and I never saw the ending twist coming. Emily and Ava used to be best friends and they had daughters the same age. Both women have big secrets. Emily is adamant to get back into Ava’s life that she is willing to do anything. She is obsessed. Can one of them reveal their secret before it’s too late?

What's Mine Is Yours gripped me from the very first page. Right away, I knew there was something different about it - it’s a domestic thriller, yes, but with such raw emotional layers and a storyline that felt so real. I was exhausted and desperate for sleep, but I simply could not put it down until I reached the final page and learned how everything would unfold.

I didn’t guess the ending, and honestly, I’m glad I didn’t. The slow uncovering of the truth is heartbreaking in all the right ways. I found myself truly empathising with Ava and her daughter, Lexi.

At first, Lexi seems like yet another spoilt, moody youngster - but as the story progresses, you realise she’s just an eleven-year-old trying to make sense of a world full of adult secrets and complicated love. She just wants to be loved. What she doesn’t yet understand is that her mother does love her - maybe even too much - and Ava’s desperate need to protect her is what drives so much of this story’s emotional tension.

The relationship between Ava and Emily is fascinating to unravel. It’s hard to know who to trust at first - who’s telling the truth, and who’s hiding something darker. The idea of swapping homes is such a clever setup, creating an instant unease as Ava’s carefully protected world is invaded. There are so many small, subtle hints along the way, but it all leads to a conclusion that hit me far harder than I was expecting.

Leah Mercer’s writing is sharp and insightful. The way she builds character is so natural—you feel like you know these people, like you’ve heard whispers of their lives somewhere before. And that’s what makes the emotional fallout so impactful. It doesn’t feel like a story, it feels like something that could happen to someone just like you.

What’s Mine is Yours is a beautifully written, deeply emotional thriller that manages to be both tense and touching. It’s not just about lies and secrets, it’s about love, guilt, motherhood, and the things we try to hide in the name of protection. An absolute standout read that I won’t forget.

This book was full of unexpected twists that kept me hooked from start to finish. Just when you think you’ve figured it out, the plot takes another surprising turn. I really enjoy Leah Mercer’s writing style and the way she unfolds a story in such an unpredictable way. The multiple viewpoints added real depth to the suspense, making the twists even more impactful. It had me reading late into the night. I couldn’t put it down. If you’re after a tension-filled rollercoaster of a read, this one’s definitely for you. I will definitely be recommending this to all my thriller book lovers. Thank you to netgalley and the publisher for the opportunity to read this great book.

This took me a while to get into but once I did I really enjoyed it, I think the pacing could have been faster in places but that is just a personal preference. It kept me guessing and the level of suspense was good.

My thanks to Bookouture and NetGalley for giving me the opportunity to read ‘What’s Mine Is Yours’ written by Leah Mercer in exchange for my honest and unbiased review.

Following a burglary that takes place at the house of Ava’s neighbour, her daughter Lexi is so upset she can’t sleep. Emily considered herself a friend until Ava stopped speaking to her and in an attempt to restart the friendship offers to swap her cramped one-bedroom flat for Ava’s five-bedroomed house in a nicer area. Ava grudgingly agrees but suspects that Emily will search through her belongings and is worried that the secret she’s been keeping all these years will be uncovered.

‘What’s Mine Is Yours’ is told through the eyes of Emily, Ava and her daughter Lexi, and despite a few twists and turns I found it so slow I was tempted to give up halfway through. I’m glad I didn’t as the characters were perfectly described and the story improved the further I read but although there was a big twist in the last chapters it wasn’t that much of a surprise as I’d already predicted it. This is the eighth novel I’ve read by Leah Mercer so I’m disappointed I didn’t like it more, but I’ll still look forward to reading more by her in the future.

A tense and fast-paced domestic thriller. The plot and character development provide enough freshness to maintain interest throughout.
Thank you to the publisher/author for the opportunity to read this complimentary advanced copy. Opinions expressed in this review are my own.

This was a fast , page turning thriller. I didn’t love the main character at first, but she won me over by the end. The villain was pure evil, but got what she deserved in the end. Bonus points for writing kids who actually felt real The ending Was satisfying, and the twist was although not surprising was. A good wrap up to book !