Michel Gerfaut (Alain Delon) makes his living playing poker. But when he stops to help an injured motorist on the side of the road one night, he unwittingly gets involved in a sinister arms deal cover-up. The capable Gerfaut goes on holiday, bringing his longtime girlfriend, Béa (Dalila Di Lazzaro), to Trouville to meet his mother (Simone Renant). He soon finds himself the target of killers hired by the pompous Emmerich (Pierre Dux) and his ruthless underling, Leprince (Michel Auclair), who suspect he's working for their competitors. Gerfaut unsuccessfully tries to get help from a policeman friend, but the police are tied in with the crooked military aeronautics company. Backed into a corner, Gerfaut strikes back against his attackers, eventually taking the fight right to Emmerich's doorstep. Three Men to Kill, based on the well-regarded novel by Jean-Patrick Manchette, was directed by Jacques Deray, who also co-wrote the script with frequent collaborator (Borsalino et al) Delon, who also produced, and Christopher Frank. Delon and Frank later adapted Manchette's Pour la peau d'un flic for the actor's directorial debut.
by Josh Ralske synopsis