Arthur Bishop is a ‘mechanic’ – an elite assassin with a strict code requiring professional perfection and total detachment. One of an elite group of assassins, Bishop may be the best in the business – with a unique talent for cleanly eliminating targets. When Harry McKenna, his close friend and mentor, is murdered, Harry’s son comes to him with vengeance in his heart and a desire to learn Bishop’s trade, signaling the birth of a deadly partnership.