Hugh Everett III's "Many Worlds" theory is now considered a hugely important breakthrough in the history of physics. This book tells the story of the physics establishment's rejection of his theory, his subsequent Pentagon career in nuclear strategy, and his difficult personal life and eventual death from alcoholism. This is an exciting book about a man who was ahead of his time by decades, although he did no more than logically apply a well-established theory against all prejudice. Peter Byrne has done an excellent job in unearthing documents, most of them unknown, about the history of Everett's ideas, their reception by the leading physicists from 1957 until today, and the consequences this had for Everett's life.