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 African refugee is shot by the police. A husband and wife are killed and their son is still missing. Another body is found in a luxurious appartment.

Moa is in her early 20s, works at a factory and lives by herself in a cottage in the forest. She is a vegan and follows her friends and demonstrations, mostly to fit in. But at home, by herself, she listens to pop music and use make-up.

Drug-dealer Sev and his equally broken girlfriend Maddie accept a risky deal from an old childhood friend, setting off an irreversible chain of events.

JW now lives in exile and is more than ever determined to find out what happened to his missing sister Camilla. Every trace leads him to the world of organized crime in Stockholm. Jorge is about to do his last score – the largest robbery in Swedish history. But during the complicated preparations he meets a woman from his past – Nadja. Martin Hägerström is chosen to go undercover into the Serbian mafia, in order to get its notorious boss Radovan Krajnic behind bars. When an assassination attempt is made on Radovan, his daughter Natalie is pulled into the power struggle within the Serbian mafia.