Benoit, the head guard of Clouville Prison, prefers to be liked than feared. This basic principle transforms the jail-house into a joyful prison, where all the inmates live amicably together. Among them, various colorful characters : a farmer, a poacher, a distiller, a forger, two pickpockets, a safe-cracker, a gangster and... a good-looking guy who pleases Rosette, Benoit's daughter, well. But too much leniency takes its toll : after Vauclin, the gangster, manages to escape and a complaint is filed against "the deplorable disorder reigning in the joyful prison", Benoit is given early retirement. He will know how to take advantage of his new status live a joyful life with his wife, his daughter and André, his son in law, in fact the nice-looking young prisoner who, in the meantime, has been cleared of all charges.
| Actor | Role |
|---|---|
 Michel SimonBenoit, chief guard | Benoit, chief guard |
 Ded RyselAuguste Tuboeuf, inmate farmer | Auguste Tuboeuf, inmate farmer |
 Paulette DubostJustine Benoit | Justine Benoit |
 Lisette LebonRosette Benoit | Rosette Benoit |
 Michel RouxAndré Chauvin | André Chauvin |
 Christian AlersSub-prefect | Sub-prefect |
| GGeorges BaconnetFerdinand Bouchonnet | Ferdinand Bouchonnet |
| FFrancis BoyerNot listed | Not listed |
 Henri CoutetGustave | Gustave |
 Robert DalbanVauclin, inmate gangster | Vauclin, inmate gangster |
| PPaul DerlyBreton, safe-cracking inmate | Breton, safe-cracking inmate |
 Émile Genevois'Petit Louis', burglar inmate | 'Petit Louis', burglar inmate |
| MMarguerite HélièsSub-prefect | Sub-prefect |
 Jane HellyNot listed | Not listed |
 Marcel RouzéBrigadier | Brigadier |
 Maryse MartinCharlotte Tuboeuf | Charlotte Tuboeuf |
 Paul FaivreFilasse, poacher inmate | Filasse, poacher inmate |
 Charles BouillaudBlafard, forger inmate | Blafard, forger inmate |
 Alice TissotMadame de St-Leu | Madame de St-Leu |
 Darry CowlMaître Larigot | Maître Larigot |