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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 the 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 Lavoie to become an informer. To test his hitman's loyalty, Dubois asks him to eliminate someone close to him. Donald disobeys the order and joins forces with other criminals to finance his exile to South America. Hunted by the Dubois clan on one side and Burns' investigators on the other, Donald finds himself caught in a tightening vise.