The kidnapping of a DA's wife, the murder of several minor criminals and the police finding a large stash of weapons is all in a day's work for criminal detective Roland Hassel.

Detective Roland Hassel's father figure and mentor, Yngve Ruda, is brutally murdered in the middle of the street. Devastated, Hassel decides to undertake his own covert investigation to find Ruda's killer and avenge him with the support of 'Triton', a special task force consisting of Hassel's most devoted co-workers. But Hassel's obsession with the case affects his family as well. As Hassel, his girlfriend Daniela and his 14-year-old stepdaughter Vida struggle to stay together as a real family they find themselves in a downward spiral taking them further and further into an abyss. Meanwhile, the evidence on Ruda's killer leads away from the street and up the corridors of power in Stockholm and Brussels. But Hassel's battle against crime and corruption knows no boundaries and he will stop at nothing.

Roland Hassel is chasing a criminal who deals with stolen luxury cars and narcotics.

A small criminal who is reported missing is found murdered in the safe of a known bank manager. While working with the motive behind the murder it is discovered that a large amount of counterfeit shares and bonds are in circulation. Hassel and his colleagues recognize that there are interests in the business community who are involved in the scandal, people who don't shy away from clearing away cumbersome barriers to safeguard their economic power.

Roland Hassel meets the dangerous Russian mafia.