While driving one evening, Harold Pelham appears possessed and has a car accident.

While on the operating table, there even appears to be two heartbeats on the monitor.

When he awakes, Pelham finds his life has been turned upside-down: he learns that he now supports a merger that he once opposed, and that he apparently is having an affair.

People claim they have seen him in places that he has never been.

Does Pelham have a doppelganger - or is he going insane?.