Arthur Bishop is a mob hit man who operates in an uncompromising world where conventional rules of morality don't apply and one wrong move could cost him his life! He's always worked alone; but, as age catches up with him, Bishop takes on a competent and ruthless apprentice and teaches him everything he knows. Together they become an unmatchable team of globetrotting killers... until the pupil's ruthlessness puts him on a collision course with his teacher!