In 1974, two couples-the Delisles and the Paquettes-drop off their kids at summer camp and are left with a slew of marital problems: infidelity, resentment, existential crises. Everything changes when Huguette buys a rifle and disappears.

Somebody mysteriously shoots at Gaétan. Was it his friend Serge, whose wife he's been sleeping with? Or was it his own wife, Huguette? When he confronts her, she reveals a surprisingly intimidating side. Is she a natural-born killer?

Her marriage might be in shambles, but Huguette might have found her calling. After impressing henchman Rene, he introduces her to his boss, Kingpin. Huguette gets her first job, but can she go through with it?

The gang bonds when they help Huguette clean up after her job. When Huguette goes to collect her compensation, she gets berated by Kingpin for botching the assignment. Huguette takes brutal revenge against Kingpin.

After René warns Gaétan that Kingpin’s planning his revenge with the help of two men, the gang try to get to them first. René confesses his feelings for Huguette. Gaétan commits his first major crime.

The gang start to think of themselves as a proper criminal organization, with the exception of Serge. But when his co-workers try to blackmail him, his dark side finally comes out. Huguette tries to scare Kingpin into retiring.

With Micheline on a cocaine bender in Montreal, Serge convinces the others to go after Kingpin's empire in Sainte-Foy. When Gaétan and Serge find themselves held hostage by Kingpin and his associate, the gang proves they're not easily defeated.

The couples restructure their organization and elect Huguette as leader. Kingpin forms an alliance with a dangerous biker gang. When they come after Huguette, the altercation ends with more dead bodies and a shocking betrayal.

The gang is falling apart. Huguette is depressed, their houses are bugged, and Serge's pool gets defiled. As Coco and Puff reveal a major secret, the gang receives a disturbing warning involving Huguette and Gaétan's son, Martin.

The gang go to rescue the kids, which leads to a bloody shootout in the woods with the bikers, Kingpin, and Biscuit. Will the legendary Sainte-Foy Killers make it out alive? And will they finally achieve marital bliss?