When the severed head of a senior Montreal police officer is found inside a dumpster, Victor Lessard and Jacinthe Taillon must solve the murder. Assisted by Loïc Blouin-Dubois and Nadja Fernandez, they face a ruthless killer who paints haunting graffiti near his crime scenes. This agonizing descent into the mind of a homicidal madman shakes Victor to the bottom of his soul.