The Danish National Police's Unit One is back to solve more cases in the second series of UNIT ONE, some of which hit too close to home for the team: Ingrid Dahl (Charlotte Fich, HEADHUNTER), second-in-command "I.P." Sorenson (Waage Sandø, WINTERBORN), detective inspector Allan Fischer (Mads Mikkelsen, TV's HANNIBAL), crime scene officer Thomas La Cour (Lars Brygmann, THE CELEBRATION), information officer Gaby Levin (Trine Pallesen, TV's THE KILLING), as well as chief Ulf Thomsen (Erik Wedersøe, IDIOTERNE) who continues to involve the team in cases for strategic purposes. In the second series' first episode, Ulf fears that the disappearance of nine-year-old Casper (Andreas Jessen, THIS LIFE) is the work of a killer whose previous unsolved death continues to haunt him, but the case proves far more complicated and may require an outright illegal solution. In the second episode, defense attorney Kirschner (Ole Lemmeke, WHITE NIGHT) finds himself in the unenviable position of needing the help of Unit One against a stalker even as he is dismantling their case against the murderer of Ulla Englund (see series one episode six).

The third episode takes the team back into the more (relatively) comfortable milieu of murder with the ostensibly accidental death of a chocolate company executive (Steen Springborg) in a sex game. Naturally, this is a cover-up for a murder and the team unveil many unsavory details about the victim and those around him before a tragic conclusion. The team investigates the arson death of a school teacher in episode four. With her daughter in intensive care with severe (potentially fatal) carbon monoxide poisoning and the grieving husband (Kristian Halken, OLDBOYS) acting suspicious despite a clear alibi, the team turn their interests to the extramarital partners of the couple and discover a murderously twisted mind behind the crime. In episode five, the team investigate a pair of honor killings apparently committed by a twelve-year-old Turkish immigrant against his sister's (Lotte Bergstrøm) rapist and find that the evidence doesn't add up (especially when they discover that the daughter is still a virgin). Episodes six and seven comprise the series' only two-parter in which they discover that the body of a ten-year-old boy discovered in the woods after a week is indeed the latest victim of a serial sex killer. When their chief suspect's suicide-by-hanging turns out to be a murder, the team must prove amnesiac La Cour's innocence and find the real culprit.

The teams private lives are no less twisty. Ingrid fears becoming distant from her son and stepdaughter as she enrolls them in private school during the week. She has also begun seeing forensic pathologist Boysen (Michael Falch, APPLAUSE) - who her children like - but she also meets a Swedish writer (Torbjörn Lindström) on one of the cases and continues seeing him. I.P. is reluctant to reconcile with his wife Kirsten (Lisbet Lundquist, IN YOUR HANDS) - who may still be seeing Ulf behind his back whose drinking is effecting her acting gigs - and is becoming more exasperated with the headlines of flirtatious tabloid reporter Trine (Benedikte Hansen). The unit's driver/ex-football star Johnny Olsen (Lars Bom, PUSHER) proposes to Gaby and she accepts, but puts her own special announcement on the back burner when she suspects that Johnny may not be able to disentangle himself from his first wife (with whom he has two kids). Fischer has a one night stand with local detective Ida (Christine La Cour) and is relieved to find out she's soon to wed (only to run into her on subsequent cases and discover that she's now very available and very interested). Profiler Helene (Susanne Storm, MIFUNE) comes back into La Cour's life as he starts to worry that the seemingly psychic turn his crime scene visualizations have taken are signs of a mental breakdown (I'm really hoping they don't play up the "psychic" angle in the next series).