"Once you've crossed the line there's no going back"
When a body is found on the bridge between Denmark and Sweden, right on the border, Danish inspector Martin Rohde and Swedish Saga Norén have to share jurisdiction and work together to find the killer.
Henrik and Astrid are trying to get used to being father and daughter again. Meanwhile Saga gets a breakthrough and the murderer is revealed and arrested under dramatic circumstances. The murderer even confesses to the six killings/revenges. But Saga discovers something which doesn't fit. She goes back to the prison in Sweden and talks to the girl who almost killed her, and here she gets a terrible suspicion: there is another killer - and there is still one person left to be a victim!