Michael McCauley is a former NYPD detective turned insurance salesman who commutes on the same passenger train to and from work every day. Facing financial struggles and recently let go from his job, Michael's routine is disrupted when a mysterious woman named Joanna approaches him with a peculiar proposition. She inquires if he would be willing to locate a single passenger who doesn't belong, in exchange for a significant cash reward. Intrigued and desperate for money, Michael accepts the task, unaware of the dangerous consequences that lie ahead.

As he begins to scan the train's passengers for clues and attempts to uncover the identity of the unfamiliar commuter, Michael realizes that he's entangled in a deadly conspiracy. The situation escalates when threats against his family are made if he fails to complete the assignment. Caught in a dire situation that tests his morals and his will to protect his loved ones, Michael must work against the clock to solve the mystery while untangling the web of intrigue that he has unwittingly become a part of.