Doppelganger

A unique technothriller from the master of novel plots and thrilling denouements

Dylan Moran's world came crashing down one rainy night: his car was swallowed by the swollen river and his beloved wife was left underwater. Since then, Dylan has been wallowing in grief while experiencing terrifying visions: wherever he goes, he's followed... by himself.
He attributes it to the trauma he has experienced, but then meets a psychologist who tells him that Dylan has been undergoing special treatment for some time. It is based on the idea that every choice one makes in life creates an infinite number of parallel worlds. In some, Dylan is happy. In others, he becomes a murderer...