Ernest Hemingway and Martha Gellhorn had no idea of what they would discover when they set out for Hong Kong, China, and Burma in 1941. The husband-and-wife team of celebrity literati intended to report on the China-Japan war while honeymooning in the romantic Far East. What they found was a maddening, intriguing, colorful world of dictators and drunks, scoundrels and socialites, heroes and halfwits. And their trip proved to be the beginning of the end of their marriage.When the U.S. Treasury Department hired Ernest Hemingway as a spy in China in 1941, it awakened a new obsession in America's...