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.