The Other Sister

By: Theo Baxter

Many thanks to Zooloo’s Book Tours for the ARC of this book and the stop on the book tour!

About the Book

Celeste left her sister behind. Now she’s coming home…

Dr. Celeste Monroe seems to have the perfect life—a thriving psychology practice, bestselling self-help books, and the respect of her peers.

But when patient Daniel St. Clair begins stalking her and releases doctored recordings of their sessions which go viral, Celeste’s career crumbles overnight. As death threats flood in and her reputation disintegrates, she realises that what’s happening in the present may be linked to her own troubled past.

When Celeste was fourteen, her abusive mother was murdered. Celeste testified that her twin sister Leah was the killer and Leah was incarcerated in a mental institution.

Now, under intense scrutiny, Celeste’s past is coming back to haunt her. What really happened the night her mother died? Did Celeste know more than she said? Someone out there seems to think she did and now they’re threatening to destroy her.

As Celeste’s world spirals and her memory begins to fracture, she must confront a terrifying question: What if the fugue states she’s suffered since childhood have been hiding a truth far darker than she ever imagined?

My Review

I’ve been a fan of Theo Baxter for a while, so I excited to read this book. And just like all his other books that I’ve read, this one does NOT disappoint! The thing about his books is they really do keep you guessing. And just when you think you have the answer, he adds another layer to the plot that you didn’t see coming. I really thought I had this one figured out, and then BAM! a twist that I didn’t see coming! And not just one.. no no no, that wouldn’t be enough. There was at least 2-3 that I didn’t see coming!

Baxter artfully writes this book with building tension. It’s not an extremely fast paced book, but it doesn’t have to be. The tension keeps you reading, the suspense of what is going to come next. I think what really gets the reader is that something like this can ACTUALLY happen. There is no need to suspend belief here.

I wish we had gotten more of a peak into the experiments that the mom did to the girls, but it wasn’t necessary to the storyline. It’s just me being curious. Either way, this is a must read book!!! So please, check it out!

Publish Date: January 18, 2026
Find the book here.
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About the Author

Theo Baxter loves writing psychological suspense thrillers. It’s all about that last reveal that he loves shocking readers with.

He grew up in New York, where there was crime all around. He decided to turn that into something positive with his fiction.

His stories will have you reading through the night—they are very addictive!

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