Three-year-old Hanna wakes up to find she has been abandoned. Her family is gone. The house is locked. She is trapped. Meanwhile, a teenage girl has been found murdered aboard the Cinderella, a cruise ship which sails between Sweden and Finland. Detective Chief Inspector Conny Sjoberg visits the girl s home to deliver the tragic news. But as he investigates, it becomes chillingly clear that the girl s younger sister is in grave danger - unless the police can trap a vicious killer. And all the while, somewhere in Stockholm, a little girl waits to be found and rescued.