You think about an old friend you haven't seen in a while - and he calls you out of the blue. You meet a stranger who knows your cousin - who lives on the far side of the world. You hear a phrase spoken on the radio - just as you read it in the book in front of you. Most of us dismiss such odd, everyday occurrences as insignificant. But writer George Daly can't help wondering what lies behind them. A quiet man living in New York City with his art dealer wife, Sara, George has never had anything truly unusual happen to him. So when he starts researching the phenomenon of coincidence for his next book, he regards his investigation as a purely academic exercise - until he discovers his family's hidden link to a dazzling theatrical couple of the 1950s and the twin brother he never knew he had. Larry Hart, a charming but unscrupulous man, is at first as astonished as George to meet his double. He quickly finds a way to turn this strange occurrence to his advantage, plunging George into a nightmare of deception and betrayal that threatens both his sanity and his life. Yet the true nature of what has happened threatens the survival of both men. And when its shocking implications are revealed, Larry and George find themselves locked in a deadly confrontation - one with a stunning and unexpected conclusion.