The Mother-in-Law

by A.J. Carter

Home is where the heart stops…

When Cassie moves into her mother-in-law's house to escape mounting debts, she expects the usual domestic criticism of her marriage, snippy comments about her career choices, and constant comparisons to her husband’s ex. But behind closed doors, something far more sinister lurks in this family's dark past.

As mysterious deaths plague their neighbourhood, Cassie uncovers disturbing lies beneath Margaret's manipulative behaviour. Her mother-in-law isn't just the monster she feared – she's harbouring a shocking truth that puts everyone in terrible danger.

In this gripping psychological thriller, perfect families hide the deadliest secrets of all.

—————

Genres: Thriller, Mystery, Amazon, Suspense

390 pages, Kindle Edition

Published January 2, 2025

About the author

AJ Carter is a psychological thriller author from Bristol, England. His first book, The Family Secret, is praised by critics around the world, and he continues to regularly deliver suspenseful novels you can’t put down.

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Reviews

[Mark]

I always think I have discovered the worst ( but best ) character and none will surpass

Margaret does

She is unbelievably bad ( good! ) treacherous, deliciously sharp, manipulatively outstanding and can bring fear just by the clacking of her ‘afternoon’ shoes on a polished wooden floor

What Margaret wants, Margaret gets and woe betide any mere mortal who gets in her way, wether presiding over the church flower committee or spiking fear in the local shopkeepers she is more than a force to be reckoned with

I loved loved loved to hate her! The book club fiasco she caused was pure brilliance….

Alongside Margaret there is a dark, well more than one tbh, story that is superbly put together and builds in tension

One part of the book actually had me wanting a character to turn around and run and made me shout ( inside my head 🤗 ) ‘Don’t do it’ rare I feel actually scared for a character but in this book I did

My favourite read by this prolific author who always writes a good story, this time he has excelled

Beware of Margaret…

[Emma]

In AJ Carters latest book, The Mother-in-Law, Cassie finds herself in a precarious situation. Moving into her mother-in-law Margaret's house to escape the crushing weight of financial burdens, she anticipates the usual familial discord: the nagging critiques of her marriage, the pointed remarks about her career choices, and the relentless comparisons to her husband’s ex-wife.
However, what Cassie discovers within the walls of this home is far more unsettling than she ever could have imagined.
As she navigates the daily challenges of living with Margaret, Cassie becomes increasingly aware of an underlying tension that permeates their lives.

AJ Carter's mastery of psychological tension is evident in every aspect of his gripping narratives. The unfolding plot twists and unexpected turns ramped up the suspense, making it impossible to put the book down. His skilful use of pacing plays a crucial role in maintaining this tension. Throughout the story, I was drawn into a web of psychological intrigue. Another absolutely brilliant book which I was gripped to from beginning to end.

Thank you so much AJ for having me on your ARC team and for an early copy of your fantastic book.

[Nora]

Oh my gosh! This book was really good and scary! don't read it at night!!!

I definitely recommend this book!

And, no....I'm not THAT kind of Mother-In-Law!!!!

[Brianna Harvey]

I would’ve left the husband before chapter 2 wtf

[Shanna TheG]

This book PMO. So many questions: why not leave the husband immediately?

She knew the mom was a killer because SHE TOLD HER SHE WAS, then Cassie acts surprised and it’s like some huge plot twist when she finds the items in the box.

Why not call the police? Why go into the house from the room when she thought she miraculously left after she tried to kill her?

Why is Nathan allowing Tracey near him at all? Why doesn’t Cassie set boundaries?

Why did Cassie agree to this arrangement in the first place?

How does this frail old lady scare a healthy young woman, physically it’s not even a match like WHAT?

Why do Cassie and the MIL have beef but then Cassie grabs the serving board anyways? And continues to be suspicious toward the MIL but then as soon as the MIL acts kindly toward her she has hope? Like do we not learn from patterns?

Why are we acting like Cassie should be supporting Nathan and that HE deserves better when his shit is the one that crashed and burned while SHE supported HIM?

Cassie had to “figure a way out of this” when the MIL literally OFFERED TO PAY FOR HER TO LEAVE.

She didn’t have anywhere to go while her husband was STAYING IN A HOTEL ROOM ALONE?????

She went into her MIL’s room to “find a box or something” to balance her camera on? Give me a break.

The second plot twist: does not make any sense, how can someone fake being that particular and awful for so long without actually being awful. The MIL also was trying to hook Nathan back up with Tracey, if Nathan was dangerous why would she be doing that 🙄🙄🙄🙄🙄🙄🙄

[Mary Luna]

sorta dumb….

I plotted through this novel hoping it would get better. Unbelievable circumstances that a woman would subject herself too. Failure to carry through continuity. For instance wonders who is at her door at 9:00 pm, did she forget she had a baby? There was twist at the end but not worth waiting for.
Pass this one.

[Shelby S. Mullins]

I hovered between 2- or 3-star review. The writing, itself, was good. There was certainly some enjoyment in choosing up sides and cheering Cassie on. However, the plot was full of holes and simply unbelievable. The ending was certainly a twist, but a very unbelievable, unpleasant and unsatisfying one. It's as if the writer got the end and just decided to write the most unlikely conclusion possible. Throughout the book, I found myself constantly thinking "Why don't you ... " as I wished Cassie would react in a more believable or clever fashion. And allowing the husband to make decisions about her sudden windfall was absolutely unbelievable. The farther into the book that got, the less the plotting rang true. I really wish this writer well, because the writing is good, as I said. But he or she definitely needs to come up with plots that actually make sense. I would love to go into detail, but I can't without introducing spoilers. I would only recommend this book if you like good writing and are unconcerned about believability.

[Shiri]

I have not seen this many bonkers characters in one book in a long time.

Cassie - do you know have any self preservation instincts? Why didn't you call the police earlier on? Or, ya know, just leave?

Margaret - what's wrong with you? The switch up from Cruella De Vil to 'oh no I was just trying to protect you' is insane. And why didn't you just kick Nathan out earlier on?

Nathan - You make zero sense. Could you have explained those murders any more terribly? And did you have a start up or not? Did you know your 'not-so-mum' was loaded? so many questions

Tracey - You were ok trying to get back together with a suspected serial killer / brother figure? And are you a software engineer / lawyer combo? what is going on there girl?

[Charlotte Marshall]

I mostly enjoyed this and there was a good twist towards the end but it was a bit repetitive, the same phrases would be used in consecutive chapters - how many times does she need to say that she’s timing her bathroom visits?
Or the police cars that were lighting up the house, and then in the chapter the lights were lighting up the house - even though it had already been said that they’d arrived.
And the damn ring light - they’re like £100, why go on about how expensive it is?

[Shelby Peronace]

Very much a slow burn, I found myself struggling and lacking interest. The last 10 chapters picked up a little bit, definitely not my favourite read, much more compelling thrillers out there.

[Sam Gutowski]

Started off okay…. but oof that was a rough read. The twist was very underwhelming and the ending dragged on.

[Jessica Banks]

What a load of fantastical nonsense

[Katie Carter]

BORING - half way through the book and nothing had even happened. Just the same shit. Sorry to be brutal but what a snooze fest

[Brittney Lee Marie Cotrona]

So obviously I loved this book...
Did I like the mother in law? No. But we, the reader, was to be made to NOT like her.
Nathan... I figured his role out early on, that's why I gave this book 4 stars.
Tracey's relation to Margaret and Nathan was definitely a shock! I did NOT see that coming.
Oh, and the ending? A 6-month old daughter? WHAT IN THE WORLD.
4 stars. Wouldn't read the authors other books to be fully honest with you, but this was a gripping quick read!

[Miss_curly_tots]

so what a character Margaret is!! I grew to dislike her, but in the end, she had her reasons for being so mean. It's one messed up book with the twist i was not expecting!

[Barbara Birchall]

Proof reader?

Venison that changes to beef.
Footsteps on extra thick carpet?
"Our car" (VW) becomes a range rover two pages later.
Cassie would have been taken to a hospital before being questioned by the police.
No mention of what Margaret is charged with for hiding the "tokens"

[Gwynn M]

This was a hard book to get through and finish. So many repetitive descriptions, which I plowed through. So much of that could have been left out. The story was very predictable and the ending made me so mad.

[Jackie]

I

just didn’t care for this book. The story was so far fetched and unbelievable. The ending was ridiculous. It screams sequel.

[Jen Owens]

This is yet another twisty tail. I love all the turns. I jumped to the conclusion too quickly. Must read.

[Michelle Pepe]

This book was beyond stupid

[Ankita]

Mother-in-Law starts with a compelling premise and does a good job of building tension around a deeply disturbing family dynamic. The beginning especially kept me hooked, with enough mystery to make me want to understand what was really happening behind the seemingly ordinary relationships.

However, I found some aspects of the plot difficult to believe. The biggest question for me was the mother’s role: how could she knowingly plan to get a seemingly deranged and dangerous man married to her beloved daughter? Her motivations needed more explanation because the decision felt too extreme to be convincing.

I also struggled with Cassie’s complete lack of awareness about her husband’s character. It would have been more believable if the story had shown a few earlier incidents—perhaps moments of unexplained anger, controlling behaviour, or subtle violence—that Cassie dismissed at the time but could later connect to the bigger picture. That would have made the revelation much more powerful.

The beginning and build-up were definitely the strongest parts of the book. The suspense worked well and created plenty of anticipation. Unfortunately, I felt the ending was a little off and didn’t quite live up to the tension established earlier.

Overall, an intriguing and fast-paced psychological thriller with a strong start, but one where the character motivations and ending could have been developed more convincingly.

[Elizabeth]

The Mother-in-Law (kindle edition) a thrilling psychological thriller by AJ Carter which I thoroughly enjoyed.

Cassie and Nathan are in dire straits due to their mounting debts and have no alternative but to move into Nathan's Mother's home in a quaint village called Little Maudsley where four local people have been murdered. Talk about out of the frying pan into the fire comes into play when they give their flat up in London to move into the wicked witch's domain more so for poor Cassie.

Cassie makes money by making beauty tip tutorials but not nearly enough to contribute to the mounting debts and Nathan strives to make a living doing freelance coding jobs.

Poor Cassie has to endure her Mother-in-law Margaret's condescending ways and to top it all Margaret invites Tracey a former ex girl friend to stay over.

Margeret's house becomes like a prison to Cassie as she and Nathan are beholden to Margaret for a roof over their heads until they clear up their outstanding debts.

I love the way AJ Carter describes emotions, menacing sounds of footsteps, the vivid colours of Margaret's roses which symbolise secrets. Cassie too is going to discover secrets which will shock her to her core and put her in danger of her life.

Hold on to your hats for the fantastic twist at the end.

[Terri | Twist & Doubt | Bookstagram]

Cassie moves with her husband into his mother’s home, hoping for a fresh start - but instead finds herself trapped in a tense and toxic household.
Secrets surface, relationships crack, and Margaret’s cruelty pushes Cassie to her limits.

It’s an easy, bingeable read that kept me turning the pages, with short, punchy chapters and enough tension to keep things moving. The story definitely has that addictive “just one more chapter” feel, even if the twist itself was a bit predictable. I found myself hoping for something a little more unexpected, but the pacing and drama still made it entertaining. The ending finally gave a hint of the spark I’d been waiting for, though it arrived a touch too late to really wow me.

Overall, it’s a solid, fast-paced domestic thriller that fans of Freida McFadden will probably love - quick to read, engaging, and packed with that blend of family tension and psychological suspense. For me, it landed somewhere between satisfying and safe, but still a fun one to add to your weekend reading stack.

[Gem Woodroofe]

The Mother-in-Law by A.J. Carter is an absolute must-read for anyone who loves a gripping psychological thriller that refuses to let go.

From the very first page, I was completely hooked. The tension builds so effortlessly, drawing you deeper into a story filled with unease, secrets, and a constant sense that something isn’t quite right. The atmosphere is brilliantly crafted - every interaction feels loaded, every moment meaningful.

What truly stands out is the relationship at the heart of the story. It’s complex, layered, and at times deeply unsettling, making it impossible not to become emotionally invested. The characters feel real, flawed, and unpredictable, which only adds to the suspense.

And that twist… I genuinely didn’t see it coming. Just when you think you’ve figured things out, the story pulls the rug out from under you in the most satisfying way. It’s the kind of ending that lingers long after you’ve turned the final page.

Utterly addictive, cleverly written, and packed with tension - this is one thriller I’ll be recommending to everyone.

[Linda Edmonds Cerullo]

This novel is filled with twists and turns and is riveting as long as you can read it purely as enjoyment. Four stars for holding my attention but at times making me wish I could scream at this clueless woman that she needs to stop waiting around and playing victim when she doesn’t have to. Forced to live with her mother-in-law and sort of hopeless husband in his childhood home when their debt becomes too much to handle, Cassie is a makeup artist who offers tutorials on YouTube. Her mother-in-law is an irritating, antagonistic pain who has a menacing quality that both aggravates and terrorizes Cassie. Regrettably her husband is very tied to his mother’s apron strings and takes her advice to heart way too often even when Cassie can clearly see she does not have good intentions. Why she behaves as she does is where the real mystery lies. Satisfying ending if you can overlook Cassie’s stupidity.

[Lynn Kearsey]

Mother-in-law from Hell! Or not?

In all of my readings over the years, it seems to me that male authors, who write with females as their major character, lack a bit of perspective in understanding the woman's characteristics and what makes her tick. Not so here! AN Carter has done a great job weaving a tale around three major characters: two women - a mother-in-law, a daughter-in- law, and the husband/son. Nathan & Cassie have been married for six years when they start having money troubles. They go to live with his mother, Margaret, and trouble brews between the women. Margaret is rude, cunning and sad attic to Cassie, but Nathan always seems to side with mother. Three murders have taken place in the small town and Cassie suspects "dear old mum". The plot thickens with twists and turns, leading taken surprise ending. I thoroughly enjoyed this novel.

[Cherihy808]

4 ⭐️⭐️⭐️⭐️. Well if you are engaged but haven’t met your future mother in law yet, then this story might freak you out a bit! This book was crazy! Margaret was pure evil to Cassie. Nathan annoyed me so much and honestly I didn’t know what to think of Tracey. So I did have two predictions regarding the twist and I’m guessing most people were thinking the same things…one ended up being true. Honestly, I kinda wish my other prediction would have been the outcome because then it could have taken a different turn at the end….BUT there was part of the ending that I did like, so I guess I can see why the author chose the path that he did. Hard to talk about it without giving spoilers. Overall, I really did enjoy this one and look forward to reading more by this author.

[Mrs B E Woods]

How to describe this book without spoiling the plot?!

A real psychological thriller, in every respect.
Having read all of this author’s books so far, both American crime and British Psychological genres, I am more and more impressed by each new story. The Mother In Law is so gripping and full of truly unexpected twists and turns that, for once, I was unable to even begin to guess where the story twists would suddenly pop up and - when they did - it was impossible to put the book down. One of the most talented young, British authors’ whose writing never fails to keep his readers totally gripped, and all without the need for foul language. Each book can be read alone and every one is a psychological masterpiece. Highly recommended.

[Mary]

Another psychological thriller with a twist at the end.
"When Cassie moves into her mother-in-law's house to escape mounting debts, she expects the usual domestic tensions: criticism of her marriage, snippy comments about her career choices, and constant comparisons to her husband’s ex. But behind closed doors, something far more sinister lurks in this family's dark past.

As mysterious deaths plague their neighbourhood, Cassie uncovers disturbing lies beneath Margaret's manipulative behaviour. Her mother-in-law isn't just the monster she feared – she's harbouring a shocking truth that puts everyone in terrible danger." synopsis copied

[Janine Roussouw]

Nathan and Cassie are married and struggling with rising debt, as Nathan is struggling with his startup business and Cassie does makeup tutorial videos. So Nathan's mum suggests that Nathan and Cassie move in with her till they get back on their feet financially. Nathan's mum is the mother-in-law from hell for Cassie with her barbed comments and hinting that Nathan's ex's would have been a much better match for her darling son.
For me the book dragged along a bit too long with the animosity between Cassie and Margaret. The plot twist at the end was good with a nice surprise at the end.