Serie Noire (1979)

Franck Poupart is a slightly neurotic door-to-door salesman in a sinister part of Paris' suburbs. He meets Mona, a teenager, who's been made a prostitute by her own aunt. Franck would like to change his life and also save Mona from her aunt. Murder is the only solution he finds to achieve his goal... A very gloomy movie, exuding despair and uneasiness, with pathetic characters.