When Police Inspector Roland Hassel's father figure, manager and mentor, Yngve Ruda, is brutally murdered on an open street in Stockholm, a devastated Hassel decides to conduct his own investigation. Hassel recruits a task force of trusted partners.

It is clear that Fatima Nidal is becoming increasingly interested in Hassel and his group in the police's internal investigations. Obsessed with finding his mentor's murderer, a detective recruits a task force of trusted partners.

Slowly, desperation and paranoia begin to appear in the hunt of Ruda's killer. Hassel is entangled in a game and is forced to ask himself the question of who he can really trust. A detective recruits a task force of trusted partners.

The clues now point to Jovan Bosco Boscovic who is a notorious professional nightclub owner from the Balkans. Apparently, some compromising images play a crucial role in the investigation. A detective recruits a task force of trusted partners.

Bosco is back in Sweden at the same time as his former girlfriend Andrea Lovrén seems to have on an important piece of the puzzle in the investigation into Ruda's death. A detective recruits a task force of trusted partners for a mission.

Fatima Nidal decides to bring everyone for questioning. At the same time, it seems as if someone is opposing Nidal in his internal investigation. Obsessed with finding his mentor's murderer, a detective recruits a task force of trusted partners.