A Parisian police chief has an affair, but unbeknownst to him, the boyfriend of the woman he’s having an affair with is a bank robber planning a heist.

After carrying out a flawlessly planned hit, Jef Costello, a contract killer with samurai instincts, finds himself caught between a persistent police investigator and a ruthless employer, and not even his armor of fedora and trench coat can protect him.

When French criminal Corey gets released from prison, he resolves to never return. He is quickly pulled back into the underworld, however, after a chance encounter with escaped murderer Vogel. Along with former policeman and current alcoholic Jansen, they plot an intricate jewel heist. All the while, quirky Police Commissioner Mattei, who was the one to lose custody of Vogel, is determined to find him.

Marceau Léonetti, a competent and energetic officer stops by chance the son of an influential lawyer driving under the influence of alcohol. A few months later, the lawyer falsely accuses Léonetti as being violent and incompetent. As a result Marceau is transferred to a small police station, where he meets young and beautiful Jeanne. Soon they are faced with a tough investigation.