Christian Brandin

GSI follow up a weapon trail that leads right into Kavkaz mafia headquarters on the west coast. GSI member Niklas Saxlid is the one in the group who is specialized in undercover operations, and he has penetrated Kavkaz' activities. But suddenly something happens and Niklas disappears.

Lasse and Maja have had their detective agency shut down by the police chief when a customer ask for help to prove her father is innocent of the train robbery he was convicted of. Lasse and Maja now see their great chance to show off.

Johan works in tandem with the GSI organized crime unit to bring in a cadre of armored car robbers

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.

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.

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

John Falk is on a routine mission with the Gothenburg police special unit GSI. With the help of a Norwegian undercover police and a civilian infiltrator in one of Gothenburg's heaviest criminal gangs, the GSI are trying buy six assault rifles and thus get them off the street. But suddenly everything changes when a new unknown player suddenly and immediately wants to buy not only those weapons but even more, including armor-piercing shells. GSI realizes that this can not be any ordinary robbers. Someone will start a war on the streets of Gothenburg. At the same time as the situation gets more and more complicated for John Falk's infiltrator Frank Wagner when the leader of the gang he infiltrated realize that one of his own leaking to the police.

It's been two years since John Falk and Frank Wagner broke their cooperation and Frank started working undercover with the police. Frank's search for Kevin crosses Johan's investigation and opens up a new collaboration between them - with the big difference that this time it's personal for Frank.