Lizzie and Alice are the best of friends. Until one day when they're out playing by the train tracks, and a childish spat triggers Lizzie's epilepsy. When she comes to, she finds an unimaginable horror: Alice has been killed. Years later, Lizzie has tried to move on. She's engaged to a wonderful man and is starting a new life in London. But someone from her past isn't willing to forgive and forget. The compelling new thriller from the Sunday Times bestselling author of "The Rumour".