Arthur Bishop has left his days as an elite killer behind - at least that's what he thought! But then the murderous past catches up with him: Bishop's archenemy Riah Crain kidnaps his girlfriend Gina and forces him to return to his old job. Within a very short time, the 'Mechanic' is supposed to travel around the world and do what no one can do as well as he can: commit three almost impossible contract killings and make them look like accidents...