After hearing an emergency call from a distressed teenager, Bach arrives at a peculiar crime scene: an empty car with smashed windows and a trunk full of snakes. With little else to go on, Balthazar and Bach race to find the missing girl.

Balthazar and Bach finally track down a suspect in Lise's murder case, only to find he has been dead for 10 years and the real killer has been using the identity of the deceased. Balthazar has little time to process his emotions before being pulled into a triple homicide investigation of teenagers butchered during a camping trip.