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.

A Marine Corps veteran suffering from PTSD takes his kids from California to Groom Lake, Nevada. He tells his children that alien parasites have landed on Earth to take over the planet. As their journey takes them in increasingly dangerous directions, the boys will need to leave their childhoods behind.