Mia Hughes is only sixteen years old when she loses her sister after a summer storm catapults their boat into the rocky shoreline. Only Ben, Mia’s best friend along for the boat ride, is conscious after the crash. When he goes looking for help he discovers Mia covered in blood...and no sign of Bella. With no memory of what happened before she was found, Mia spends the next twenty-two years haunted by Bella's disappearance, only to encounter a series of tragedies that she knows have to be tied to her sister...and to Ben.