Milan must kill Louis Randoni before he testifies in a court of law. He is disturbed by his depressed roommate François Pignon who commits suicide by hanging himself from the toilet pipe flooding Milan's room. Here he is stuck in problems.

Ralf Milan, a hitman, arrives in Montpellier to kill an important witness. He checks in a hotel without knowing that his neighbour has become neurotic after his wife left him.—Jean-Yves Simon <[email protected]>