1979. Donald Lavoie is a fearsome hitman who works under the orders of Claude Dubois, head of the Montreal South-West mob. Donald is tasked to take under his wing new recruit Serge Rivard, a hotheaded small-time crook who soon compromises him in a botched double murder. Donald avoids justice thanks to the Dubois clan's lawyers, but this is only a temporary setback for Detective Sergeant Roger Burns, who wants to convince Lavoie to become an informer.
After a sexist joke goes viral, Cédric loses his job and embarks on a therapeutic journey to free himself from sexism and misogyny. He and his girlfriend hire a mysterious and liberated babysitter to help shake things up.