The Stepsister’s Secret

By: Karen King

Many thanks to Bookouture for the eARC of this book and the stop on the book tour.

About the Book

She’s family now. But can I trust her?

When my stepsister Alison moves in to look after my mother, everyone in my family is grateful. Alison’s a nurse, and she says she just wants to help. But I don’t trust her.

Years ago, when Alison and I were the same age as my own son Isaac, I made a terrible mistake that tore Alison’s world apart. Now the look in her icy blue eyes tells me: she knows exactly what I did.

I’m certain she’s responsible for my mother getting weaker. I don’t like the way she’s pushing me out, isolating me… and getting way too close to my husband, Nick.

I’m watching her. And I’ll do anything to keep my family safe. But I have no idea just how much danger we’re in…

My Review

This book reminds me of the famous saying, “you think you know, but you have NO idea.” I feel like that saying describes this book perfectly. You think you know what’s going on but you really have no idea.

Lizzie feels like something is happening to her mother and herself, that someone is after them. However, since she has a history of anxiety, everyone seems to think she’s overreacting. It’s frustrating that even her own husband chalks her feelings up to anxiety. Her stepsister Alison really does seem to want to replace her. In this book, everyone has a secret, but who is willing to go far to keep their secret?

King expertly builds the suspense throughout the book, until it crescendos for the big reveal. I will say that I did guess part of it, but I didn’t guess the other part of it. It was shocking! Then there was another thing that happened that was shocking! I really liked that it didn’t go the way that I thought it would.

If you’re looking for a great read with a shocking reveal, check this one out!

Publish Date: February 16, 2026
Find the book here.
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About the Author

Karen King was born in Birmingham and has always enjoyed reading and writing. She’s been published for over thirty years, in a variety of genres for both children and adults. She loves writing about the complexities of relationships. Her first three books for Bookouture were romances where relationships came right, she has now turned to the darker side of relationships, writing two psychological thrillers about relationships that go badly wrong. Karen now lives in Spain where she loves to spend her non-writing time exploring the quaint local towns with her husband, Dave, when she isn’t sunbathing or swimming in the pool, that is.

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