A Parisian couple decides to sell an unsanitary basement in their building. A very ordinary, nondescript man, Mr. Fonzic, shows up to buy it. Nothing unusual there, until the man moves into the cellar and makes it his permanent residence. The couple tries desperately to cancel the sale but to no avail. Worse, Mr. Fonzic becomes a threat to their family as he befriends their teenage daughter on whom he seems to exert a perverted influence.
| Directing | Philippe Le Guay | Director |
| Writing | Gilles Taurand | Screenplay |
| Writing | Philippe Le Guay | Screenplay |
| Production | Anne-Dominique Toussaint | Producer |
| Camera | Guillaume Deffontaines | Director of Photography |
| Production | Constance Demontoy | Casting |
| Art | Emmanuel de Chauvigny | Production Design |
| Art | Thybault D'Anzul | Set Decoration |
| Costume & Make-Up | Elisabeth Tavernier | Costume Design |
| Production | Philippe Le Guay | Co-Producer |
| Costume & Make-Up | Margo Blache | Key Hair Stylist |
| Costume & Make-Up | Vesna Peborde | Key Makeup Artist |
| Costume & Make-Up | Caroline Pestel | Hairstylist |
| Sound | Bruno Coulais | Original Music Composer |
| Sound | Matthieu Fichet | Dialogue Editor |
| Sound | Olivier Goinard | Sound Re-Recording Mixer |
| Sound | Vincent Milner | Foley Artist |
| Sound | Jonas Orantin | Foley Mixer |