Bach calls on Balthazar to examine a young woman found dead in a truck, but the deceased's body is completely frozen. The police have few leads to go on until Balthazar finds a piece of evidence that connects her to a seemingly unrelated case.

Balthazar examines a dismembered corpse found in the river, but when the body parts don't match up, he realizes there's another victim. As Bach investigates the crime, Balthazar debates whether to tell her that Lise's killer may have committed six other murders.