Seventeen-year-old Jenny is abducted in broad daylight and taken to a dilapidated, isolated house where she is chained and caged along with several other girls. Their captor is unpredictable, and as wily as he is cruel: he foils every one of their desperate attempts to escape - and once caught they rarely survive their punishment. Five years later, Jenny is found dead in a public park, and the police are scrambling to find a lead among the scant evidence. But Detective Joona Linna realises that this murder has an eerie connection to a death that was declared a suicide years before. And now when Mia, a seventeen-year-old orphan, goes missing, it becomes clear to Joona that they are dealing with a serial killer - and the murderous rampage has just begun.