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. I hoped she didn't realise, but 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...

A totally unputdownable, twisty story of family secrets that have deadly consequences. Perfect for fans of Shari Lapena, Freida McFadden, and Daniel Hurst.

What readers are saying about The Stepsister's Secret:

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Wow!... utterly GRIPPING! ???... drew me in from the very beginning... a rating of a whopping ?10! ?. Deffo a MUST-READ... I loved this book! I couldn't put it down.' NetGalley reviewer, ?????

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'I was hooked from the first page! This book had it all. Suspense, drama, family tension, paranoia it was all bursting out the pages. When I went to bed I was dreaming about it... I screamed at a bit!... Highly highly recommend!' NetGalley reviewer, ?????

'Holy chaos! This was quite the ride from start to finish... my goodness... did it ever explode... left my jaw on the floor... impossible to put down.' KKEC Reads, ????

'An exciting rub your hands together in glee kind of reader experience. I loved it. Every part of this book ticked ticked ticked away to perfection... laid out like the best of thriller reads from start to finish. I sat. I read. I had to finish the whole book. The side eye I gave when anyone tried to interrupt... gripping.' Goodreads reviewer, ?????

'Excellent... I've been gripped... brilliant... read it in a day as I couldn't put my Kindle down.' NetGalley reviewer,?????

'I absolutely loved this book! It kept me on the edge of my seat and had me wondering what was going to happen next!' Goodreads reviewer ?????

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'A brilliant and gripping read which I finished in one sitting.' Goodreads reviewer, ?????

'Had me hooked from the first chapter!... I highly recommend!' Goodreads reviewer, ????

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• Literature & FictionGenre FictionPsychological
• Mystery, Thriller & SuspenseThrillersDomestic

• Publication Date: February 16, 2026
• Text-to-Speech: Disabled
• Lending: Disabled
• Print Length: 332 Pages
• File Size: 48 KB