Alex Lewis (Liam Neeson) is an expert assassin with a reputation for discreet precision. Caught in a moral quagmire, Alex refuses to complete a job that violates his code and must quickly hunt down and kill the people who hired him before they and FBI agent Vincent Serra (Guy Pearce) find him first. Alex is built for revenge but, with a memory that is beginning to falter, he is forced to question his every action, blurring the line between right and wrong.