16-year-old Jenny Lind is kidnapped in broad daylight and taken to a dilapidated house, where she and other girls face horrors far beyond their worst nightmares. 5 years later, Jenny's body is found hanging in a playground, strung up with a winch on a rainy night. As the police are scrambling to find a lead in the scant evidence, Detective Joona Linna recognizes an eerie connection between Jenny's murder and a death declared a suicide years before. And when another teenage girl goes missing, it becomes clear to Joona that they're dealing with a serial killer--and his murderous rampage may have just begun.