After years of keeping his detectives at the headquarters, the Montreal PD has decided to reassign them to neighbourhood precincts in an effort to get closer to the population. Nadine Legrand and Patrick Bissonnette have to find their footing in their new work place: District 31.

The story takes place in 1910 in Montreal, Quebec, while a killer terrorized the city. In the same period, Florence and Camille Courval, two sisters originating in French Manitoba inherit the Eden Museum, where statues of wax in connection with criminal news are housed.

To save the life of fellow cop kidnapped by a biker gang, a father and a son who cannot stand the sight of each other infiltrate an outdoor adventure group-therapy for fathers and sons. Their biggest challenge is to survive the therapy without killing each other.