The unknown, large mafia organization is now showing its true face. The pressure that GSI and John Falk and his family have put on the organization, makes them fight back on all fronts. The rule book is thrown out. But to go after Johan Falk's family and trying to kill his wife could be the biggest mistake the organization has ever made. GSI closes up around Johan's family and the final battle begins ...

The police station is locked down. A snitch is compromised. Drastic and unexpected events take place. Both inside and outside the police station.

When Johan and his colleagues are watching Seth and his gang member Jack, they stumble on a larger case than they expected. Seth is selling arms to terrorists, but without Jack's knowledge, in a car where Johan's old colleague Pernilla mysterious appears. While Johan begin researching what Pernilla and SÄPO is doing, Jack suspects that everything is not right with Seth and that he's working with the police.

Falk is blackmailed into smuggling a truckload of guns from Latvia.

Five men break into Frank Wagner's apartment. Frank is able to escape and seeks out the help of Johan Falk. Has someone leaked that Frank is working with the police? Frank and John don't know who knows what and whom to trust.

Terrified and bloody, Oscar Svendsen awakes clinched to a shotgun in a strippers joint. Around him 8 dead men, and police aiming at him. To Oscar it's clear that he is innocent. It all started when four chaps won 1,7 million on the pools.

Johan is a two-fisted Gothenburg cop who finds himself in a shoot-out with jewel robbers. After the smoke has cleared, one robber, shot by his accomplice, and an innocent bystander, are dead. Three witnesses, including Helen, identify thug extraordinaire Leo Gaut as being the dead crook's trigger-happy colleague. Gaut soon threatens the three witnesses, and only Johan, the badge-wearing hero, can save them.

Johan Falk and his colleagues at the GSI go after sex traffickers importing young women from the East and forcing them into prostitution.