A woman suicides on the same day that her husband is awarded a medal of honour. Laurène suspects that this man isn't quite the hero that everyone thinks they know. She tries to discover what dark secrets he's hiding, but he's protected by the Mayor, an old childhood friend.

The investigation into the disappearance of the Mayor's daughter advances with the discovery of her body in the middle of a bizarrely staged location. While Bertrand loses control and seeks vengeance, Laurène finally gets close to the invisible enemy that she's been tracking for many years.