Arthur Bishop is a 'mechanic' - an elite assassin with a strict code and unique talent for cleanly eliminating targets. When his mentor and close friend Harry is murdered, Bishop is anything but detached. His next assignment is self-imposed - he wants those responsible dead. His mission grows complicated when Harry's son Steve approaches him with the same vengeful goal and a determination to learn Bishop's trade. A methodical hit man takes an impulsive student deep into his world and a deadly partnership is born. But while in pursuit of their ultimate mark, deceptions threaten to surface and those hired to fix problems become problems themselves.