From the bestselling author of All Is Not Forgotten, a thriller about two missing sisters, a twisted family, and what happens when one girl comes back...One night three years ago, the Tanner sisters disappeared: fifteen-year-old Cass and seventeen-year-old Emma. Three years later, Cass returns, without her sister Emma. Her story is one of kidnapping and betrayal, of a mysterious island where the two were held. But to forensic psychiatrist Dr. Abby Winter, something doesn't ad