Arthur Bishop was a mob hitman, the best there is. In a world where one mistake could easily cause you your very life, he has learn never to compromise, to know his mark correctly, and never to leave a trace. As age comes in, he decides to train an apprentice. He taught him everything he needs to learn in order to become an excellent marksman like himself.

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But later on he would realize that he is putting himself on a collision course against his very own apprentice because of his pupil's own ruthlessness.