Arthur Bishop (Charles Bronson) is a mob hit man who operates in a world of his own... an uncompromising world where conventional rules of morality dont apply and where one wrong move could cost him his life! Hes always worked alone but as age catches up with him, Bishop takes on a competent and ruthless apprentice (Jan-Michael Vincent) the son of a previous victim. Against the advice of his superiors, Bishop teaches him everything he knows and together they become an unmatchable team of globe-trotting killers...until the pupils ruthlessness puts him on a collision course with his teacher.