Members of the Mafia are killed off while camped out in a large house.

The mysterious Tronche is being escorted to a castle in France. However, during a stop at a motel, he is attacked by Don Lewis who adopts his identity. The castle is the secret hideout of a drug-pushing gang. Two of the crooks are killed by an unidentified assailant. While the false Tronche, Jean (head of the gang) and Pierre search the place for the murderer, Jean's lover is killed too. The four survivors are trapped because they are in hiding from the police.