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.
François Cluzet
Jacques Fonzic
Bérénice Bejo
Hélène Sandberg
Jérémie Renier
Simon Sandberg
Jonathan Zaccaï
David Sandberg
Martine Chevallier
Maître Rivière
Jack Claudany
Le proviseur
Antoine Levannier
Amos
Victoria Eber
Justine
