Alexandra Southwood lived an average, happy life with her husband, Marc, and two daughters -- until she was kidnapped, and held in a room against her will. When the police discover Alexandra's bloody belongings by the river, they turn the missing-persons case into a murder investigation, but Marc cannot accept that she is lost to him. He shifts to frantic action, embarking on his own journey through the dark maze of secrets she kept and passions he never understood. And now he's forced to confront how frighteningly little he knows about the woman he loves.