Harold Pelham, a partner in a large electronics firm, finds himself in bewildering circumstances after recovering from a near-fatal car accident. What causes him to renounce his high business principles? Why do friends and colleagues repeatedly sight him in places he has never been? And why does Julie, an attractive girl he has seen only once, claim such an intimate relationship with him? Does Pelham really have a doppelganger – or is he losing his mind?