Charles Bronson stars as professional killer Arthur Bishop, a man regarded as the best in his bloody trade. He prides himself on the fact that he can make all his hits look like accidents. After one particular job, the son of his victim, Steve (Jan-Michael Vincent) pleads with Arthur to teach him the tricks of the trade, and Arthur obliges as his solitary lifestyle is beginning to have a profound effect on him. Soon, however, Arthur becomes involved in a deadly game of cat and mouse that can only lead to the death of one of the parties involved.