Set in Montreal, the story follows Inspector Raoul Leduc as he investigates a series of mysterious events tied to the city's criminal underworld. When a scientist carrying valuable government secrets goes missing, Leduc suspects that a foreign espionage ring is involved. His suspicions lead him to a nightclub where he encounters a cast of shady characters, including an exiled gangster named Joe who has been lured back to Canada for one final job. Joe is tasked with a high-stakes mission that involves more than just the usual underworld dealings, drawing him reluctantly into a complex web of crime and intrigue.

As Leduc delves deeper into his investigation, he realizes that Joe's reappearance and the espionage activities are parts of a much larger scheme that threatens national security. Tensions escalate as both Leduc and Joe navigate through a labyrinth of deception, danger, and double-crosses. With time running out, Leduc must use all his wit and resources to thwart the looming threat, while Joe faces a moral dilemma that could determine his fate.