Series starts thirteen months after the end of the first series. A coaster veers off course and rams into the Øresund Bridge. Saga arrives on the scene and finds the ship deserted save for five people - three Swedish and two Danish – chained below deck. Saga arranges to have Martin assigned to the case. After the victims on the coaster die from pneumonic plague, a viral video appears in which four disguised eco-terrorists claim responsibility for the incident. They embark on further attacks, including blowing up a petrol tanker and distributing poisoned food. As the police close in on the group, they are all found dead in a shipping container, thus raising the question of whether there are other terrorist cells or a larger group.
