Private detective John Rosow is hired to tail a man, Harold Fullmer, on a train from Chicago to Los Angeles. Rosow gradually uncovers Harold's identity as a missing person; one of the thousands presumed dead after the 9/11 terrorist attacks on the World Trade Center. Persuaded by a large reward, Rosow is charged with bringing Harold back to his wife in New York City against his will. Ultimately Rosow must confront whether the decision to return Harold to a life that no longer exists is the right one.