book cover of The Other Sister
 

The Other Sister

(2026)
A novel by

 
 
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?

The Other Sister - the terrifying psychological thriller by the best-selling author of The Stepfather and Not My Mother.

What readers are saying about
The Other Sister:

‘…wow, what a ride. …I was completely hooked. …this is one
you absolutely need to pick up. I couldn't put it down.’ -Booksprout Reviewer

‘…a solid psychological thriller. I read this in one sitting… an
absolute page-turner!’ -Netgalley Reviewer

‘Baxter excels at character building, or in this case slowly destroying them. The story starts strong and
moves fast, keeping me hooked…’ -Netgalley Reviewer

‘…an
addictive and suspenseful read. This novel only took me a night to finish and that alone should speak for itself. I would definitely recommend this novel to fans of psychological thrillers.’ -Netgalley Reviewer

‘…exactly what I needed to get me out of my reading slump. …fast paced and
kept me engaged.’ -Netgalley Reviewer

‘…a dark,
twist-filled thriller perfect for fans of psychological suspense. It’s haunting, atmospheric, and deeply human—a story about sisters, secrets, and the terrifying possibility that the past is never truly buried.’ -Netgalley Reviewer

‘This book was exactly what I was looking for. The twists were
definitely unpredictable for me! 5 stars.’ -Netgalley Reviewer

‘This is the second book I have read by Theo Baxter and it was
fantastic!! The line between imagination and stark reality is perfectly blurred.’ -Netgalley Reviewer

‘…
hooked from the beginning! This was a read that I stayed up 2 nights in a row to finish!’ -Netgalley Reviewer



Genre: Mystery



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