An amnesiac French judge and a level-headed German detective investigate a series of murders in the Black Forest near the French-German border.
An investigation into twelve unearthed skeletons catches Camille's attention, but her amnesia hides the strongest lead.
Erik asks for Camille's help in the investigation as the killer takes justice into their own hands.
A large-scale operation lures the killer, but the final skeleton's identity sends investigators back to the drawing board.
Tensions boil over at a women's rally against violence; Erik is heartbroken when he learns the final victim's identity.
