Darkness - Those Who Kill

Louise Bergstein is on edge after her latest homicide investigation, but she's determined to continue working as a profiler on the force; when a middle-aged couple is found brutally murdered outside their home, she takes the case.

Louise locates Bjorn's little sister, Maria, whose case worker suggests that Louise mentor the young woman, since she may have her newborn forcibly removed; Frederik visits the Breidablik commune where Bjorn used to live with his mother and sister.

The police hunt for Bjorn intensifies following a new murder; Frederik and Louise uncover truths about Bjorn's past after searching Pelle's house; a decision is made about the forced removal of Maria's baby, and Frederik gets close to nabbing Bjorn.

After another crime is committed, Frederik is convinced that Bjorn is the perpetrator, but Louise points to a different criminal profile; Bjorn wants to share a secret with Louise that might close the case.

Louise moves to Aarhus for a fresh start, but the past catches up with her when Frederik seeks her help on a new case in which a disabled woman was killed; the investigation suggests her death is part of a larger pattern.

Louise and Frederik discover a connection between Bjorn and Alberte, who both grew up on the Breidablik commune; Louise moves into the commune undercover to assist the police in their investigation.