A streetwise Paris policeman who takes kickbacks from the minor criminals on his beat to allow them to continue is assigned an idealistic new partner fresh from police academy. He sets out to corrupt him...

To his family, François Voisin is nothing more than a humdrum civil servant. In truth, for the past twenty years he has been working as a secret agent. All goes well until circumstances put his secret in danger.

Paul Martin and François Leroux are brothers-in-law and comics without fame. One day, the famous television comics, Gaëtan, finds himself in the little theater where Paul and François produce themselves under the name of "Gagsters".