In their search for Kim, a clue leads Louise and Frederik to Sweden. Meanwhile, Kim hides with his stepdaughter in a remote cottage. Louise and Frederik track Kim down, only to discover yet another devastating crime.

Under interrogation, Kim confesses to the old double murder and the killing of his girlfriend, but not to the murders of Patrick and Pernille. Dismantling Kim’s alibi, Louise has reason to come up with a new theory.