A car explodes in front of a primary school where GSI boss Patrick Agrell has just left his children. The event reunites Johan Falk with Leo Gaut, a former criminal restaurant owner who Johan put behind bars a decade ago.

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

Frank Wagner goes deeper undercover to infiltrate Europe's most dangerous Mafia, the Russian-est, consisting of ex - KGB officers.

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.

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.

A tormented father witnesses his young son die when caught in a gang's crossfire on Christmas Eve. While recovering from a wound that costs him his voice, he makes vengeance his life's mission and embarks on a punishing training regimen in order to avenge his son's death.

A teenager is assaulted and killed, but returns as a ghost to find his killer.

Arn has served his term in the Holy land and returns home to be reunited with his beloved Cecilia. When he returns home, he discovers that political forces tries to separate him and Cecilia - but thanks to queen Blanka they can finally get married. Arn knows that war is looming and with his martial knowledge he starts to build an army at his new home at Forsvik.

When JW becomes a drug runner in order to maintain his double life, his fate becomes tied to two other men: Jorge, a fugitive on the run from both the Serbian mafia and the police, and mafia enforcer Mrado, who is on the hunt for Jorge.