She opened the wrong door. Now her life will never be the same.

When Lucy Foster visits her old friend, she doesn't expect to hear a baby crying behind a locked cellar door. But what she finds shatters everything she thought she knew: a terrified teenage girl and a newborn, hidden away like a secret shame.

As Lucy's quiet life spirals into a media frenzy, and as the town turns against her, one thing becomes clear -- someone is watching. And they want Lucy to stop helping the girl in the cellar.

Because the truth is darker than anyone imagines. And unlocking it may cost Lucy everything.

A gripping psychological thriller packed with secrets, lies, and jaw-dropping twists, Behind a Locked Door is perfect for fans of Freida McFadden, Lisa Jewell, and Shalini Boland.

What readers are saying about Behind a Locked Door:

"Loved!!!!! This is what a true psychological thriller should look like. It was so dark and twisted. I was literally on the edge of my seat the entire time." Netgalley reviewer, ??????????

"Behind the Locked Door is everything I love in a psychological thriller: intense, chilling, and completely unputdownable. Sarah Denzil creates an atmosphere of dread that pulls you in from the very first page and never lets go. The tension builds layer by layer, and just when I thought I had it figured out, she surprised me again." Netgalley reviewer, ??????????

"WHAT DID I JUST READ?!?!?!?! From the character development to the multiple POVs; from the short chapters to the many twists and turns, this book ran the gamut of emotions and definitely deserves every one of the five stars I gave it... if not more!!!" Netgalley reviewer, ??????????

"Oh, my word! How to sum up this gem of a book? Brilliant doesn't do it justice! Wonderful characters, really starts off with a bang, and doesn't let up till the final page. I was not expecting that glorious twist!" Netgalley reviewer, ??????????

"An exciting thriller that kept me turning the pages until the shocking conclusion. Tense, emotional, and full of absolutely shocking twists and turns. Brilliant!" Netgalley reviewer, ??????????

• We started tracking this book on July 10, 2025.
• This book was $3.99 when we started tracking it.
• The price of this book has changed 2 times in the past 114 days.
• The current price of this book is $0.99 last checked 2 minutes ago.
• The lowest price to date was $0.99 last reached on October 27, 2025.
• This book has been $0.99 one time since we started tracking it.
• The highest price to date was $4.99 last reached on September 26, 2025.
• This book has been $4.99 one time since we started tracking it.
• This book is currently at its lowest price since we started tracking it.

• Mystery, Thriller & SuspenseCrime FictionKidnapping
• Mystery, Thriller & SuspenseThrillersDomestic

• Text-to-Speech: Disabled
• Lending: Disabled
• Print Length: 314 Pages
• File Size: 42 KB