Policeman Johan Falk returns to Gothenburg and starts service at the successful special service GSI, but the relation between the unit and the criminals introduces him to a world he never thought existed.

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It has been two years since John Falk and Frank Wagner broke their cooperation and Frank stopped working undercover for the police. Frank has just had: Re-opening of his bar when his former girlfriend's brother Kevin ends up in trouble because of gambling debts. At the same time Johan and GSI Group, together with the German police, busted an unusually reckless league selling a new type of drug that is hard on young people. Frank's quest for Kevin crosses Johan's investigation and opens up a new collaboration between them - with the major difference that this time it's personal for Frank. Johan and GSI are forced to stage a second operation to entrap leaders of the drug gang. The situation becomes even more dangerous because there is another infiltrator in the game.

A group of young robbers, specializing in robbing shopping center security guards, are raging through out Gothenburg. A robbery goes awry when an innocent passerby is killed. Ricky, the gang's young leader, tries to quickly find an expert who can clean the money of the dye pack that exploded while Johan Falk, and his colleagues at GSI, accelerate their hunt. Written by gsi

Frank Wagner is sleeping next to his family. Their plans to move abroad lay on the kitchen table. They suddenly hear someone trying to break into the apartment. Five masked men are trying to enter. Frank tracts quickly and manages to escape. He contacts Johan Falk. Why would someone want to kill him? Has anyone figured out that he is cooperating with the police? Frank and Johan do not know who knows what, and who they can trust.

GSI (Group of Special Investigations) investigates a weapon deal made by the mafia. GSI sends in an undercover agent to investigate what the mafia is up to. At the same time Johan Falk confronts a mysterious woman who threatens his family.