"Cairo, 1942: If you had asked a British officer who Colonel Clarke was, they would have been able to point him out: always ready with a drink and a story, he was a well-known figure in the local bars. If you then asked what he did, you would have less success. Those who knew didn't tell, and almost no one really knew at all. Clarke thought of himself as developing a new kind of weapon. Its components? Rumour, stagecraft, a sense of fun. Its target?...

"Their average age was twenty-five. They came from Berkeley, Cambridge, Paris, London, Chicago--and arrived in New Mexico ready for adventure, or at least resigned to it. But hope quickly turned to hardship as they were forced to adapt to a rugged military town where everything was a secret, including what their husbands were doing at the lab. They lived in barely finished houses with P.O. box addresses in a town wreathed with barbed wire, all for...