Locksmith duped by burglar to commit crimes, jailed. Fellow inmates befriend him to exploit his skills for prison break. Plot revolves around his naivety being taken advantage of, leading to criminal entanglements.

A short, kind, very innocent and efficient locksmith is cheated by a burglar in order to rob a car and to open a safe strongbox. The police catch him and is sent to jail. Once there, some gangsters gain his friendship to cheat him again and to help them escape.—Michel Rudoy <[email protected]>