The Man Who Haunted Himself

Can a man be in two places at once? Can he have slept with an attractive girl in her apartment when he'd only ever seen her briefly, and didn't even know her address? It is bewildering questions such as these that torment Harold Pelham when he recovers from a near fatal car accident - an accident which has strange undertones.
Pelham himself is every inch the city businessman, conservative in dress, staid in manner with a lovely wife and a young family. A man of substance and reliability... a man truly set in his ways. So how does Julie, an attractive girl he has only seen once, claim such an intimate relationship?
As each day passes the enigma deepens, the mystery becomes more unfathomable, and more terrifying. It is only after his wife, children, and best friend turn from him as from a complete stranger that Pelham discovers the terrible devastating truth.