The brother she never knew. The nightmare she can't escape.

Charlotte Harper seems to have it all—a beautiful home in the Cheshire countryside, a loving husband, and a young son she adores. But when she collapses on a night out, doctors discover she has a rare blood disorder. Without a bone marrow transplant, she will die.

Then comes a revelation: Charlotte had a brother, John, given up for adoption at birth. Miraculously, John is a perfect donor—and he agrees to save her.

But when John moves into Charlotte's home to recover from the painful procedure, her perfect world begins to shift. Strange visitors arrive at odd hours. Whispered phone calls. Veiled threats. Her peaceful home becomes a place of fear and stress.

As his terrifying agenda becomes clear, Charlotte realizes that the price of John's gift may be more than she can bear.

Because John didn't just give Charlotte a life. He came to take one back.

The Family Secret—the chilling psychological thriller by the bestselling author of The Wrong Neighbour.