Rudy has only been on the job as a train engineer for a few months. While at the helm of a commuter train headed to Boston, Massachusetts, it hits a harlequin clown, and in the chaotic aftermath, he witnesses the horrific and inexplicable actions of a group of people who were seemingly laying in wait for the accident. There are other accidents and as the group infiltrates his life (present and past), and as random global acts of violence and suffering seem to be connected, what Rudy believes about others and himself will be forever warped as he makes his final choice.