Lambert, a withdrawn middle-aged man, works the night shift at a Parisian petrol station. He has no friends, no family; his only companion is his bottle of rum. One night, a young Arab man, Bensoussan, enters his shop — and his life. This stranger has also no family, lives alone in a dingy room, and scrapes together a living as a drug dealer. The two solitary men develop a friendship — but this is brutally brought to an end when Bensoussan is killed in front of Lambert. Lambert soon realises that his new friend was murdered by his drug dealing associates and sets out to avenge his death — assisted by Lola, a punk girl who knew Bensoussan briefly. By doing this, Lambert manages to come to terms with his own tragic past.
Source : Wikipedia