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Subtitled A True Story of Love, Spies, and the Unlikely Heroine Who Outwitted America's Enemies, this is another biography of Elizebeth Friedman, the pioneering cryptanalyst who basically invented the fundamentals of codebreaking during World War I along with her husband, William. Although much of the subject matter was already familiar to me, this book contains a much more detailed account of her World War II exploits than I had seen related elsewhere. If Fagone's sources are to be believed, she and her team were more or less solely responsible for preventing the establishment of a Nazi foothold in South America, no thanks to J. Edgar Hoover, who apparently cared more about making the FBI look good in the press than actually maintaining national security.