As a Swedish citizen is found dead at Newark, an American serial killer is on the plane to Stockholm. Sneaking past the police, killings soon start to happen in Sweden as well and after working with FBI, the Swedish police start to piece together an unsettling and complex image.

An abused woman is feverishly sought by police in the murder of her ex-husband but is being hidden by abused woman-advocates. At the same time, Gunvald Larsson discovers a police report that his long-estranged sister has been abused. He confronts her with his knowledge but she denies it.