The Danish National Police's elite Unit One is back in a third series of cases as head of special cases Ingrid Dahl (Charlotte Fich, HEADHUNTER), second-in-command "I.P." Sorenson (Waage Sandø, WINTERBORN), crime scene officer Thomas La Cour (Lars Brygmann, THE CELEBRATION), detective inspector Allan Fischer (Mads Mikkelsen, TV's HANNIBAL and THE HUNT), and information officer Gaby Levin (Trine Pallesen, TV's THE KILLING) maneuver their turbulent personal lives while traveling all over the country solving high profile crimes. The third series kicks off with the strangely straightforward case when the belongings of a student thought to have run off to the states six months ago turn up prompting an investigation long after the trail may have run cold. Crime hits even closer to home than usual in episode two when Ingrid learns that the three victims of a scuffle with a Bonnie and Clyde-esque pair of young robbers turn out to be her son's cousin, uncle, and aunt. In the third episode, the discovery of a German woman's torso in a lake may be the latest in a string of murders (or the motive may be more personal).

In the fourth episode, the investigation of the devastating Hotel Nyborg arson that killed thirty-two people takes a circuitous route towards its perpetrator when a new murder throws a monkey wrench into the works. As a result, whether the arsonist is responsible for his girlfriend's murder preoccupies Fischer during episode five's investigation into the murder of a corrupt building contractor just released from prison. Episode six is the second of the two-parter as the unit tries to prove that a young man who killed two people and wounded another in a robbery was being hypnotically manipulated by someone he identifies as his "guardian angel". In episode seven, Ingrid discovers that her investigation into her former family doctor's mercy killing of his wife has ties with the murder Fischer is trying to prove was not committed by the Nyborg arsonist. The final episode of the third series finds the unit trying to discern whether the grisly murder of a well-to-do local drug dealer was a sadomasochistic killing or an execution disguised as such, managing to air the dirty laundry of citizens, social workers, and even their fellow officers.

It almost seems like there is more of an emphasis on the personal lives the the unit, although that may be perhaps because of the accumulated back story from the first two series, but thankfully things do not get too "soapy". Ingrid is still in a rather tentative triangle with author Staffan (Torbjörn Lindström) and coroner Boysen (Michael Falch, APPLAUSE) while worrying about her kids - particularly son Tobias in light of his cousin's murder - while Fischer's marital problems come to a head (perhaps half explaining why he becomes so invested in the Nyborg case). Gaby and Johnny's relationship suffers in the aftermath of her miscarriage while I.P. and his wife - who is having an affair with Ulf (Erik Wedersøe, IDIOTERNE) - finally split up while his relationship with a journalist continues to cause trouble for the unit. La Cour returns to duty after an episode of amnesia made him a suspect in the death of a suspect in the second series, but relationship issues keep him from delving too deeply into the psyche of the cases' killers and victims.