When called to a crime scene, unconventional forensic pathologist Raphaël Balthazar immediately clashes with the new, no-nonsense chief inspector, Hélène Bach. But they must work together to solve the double homicide of a public prosecutor and his wife, who were gunned down in their home, leaving behind their traumatized young daughter.

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.