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The never-before-told tale of the German-American who spearheaded a covert mission to infiltrate New York’s Nazi underground in the days leading up to World War II—the most successful counterespionage operation in US history.From the time Adolf Hitler came into power in 1933, German spies were active in New York. In 1937, a German national living in Queens stole the blueprints for the country’s most precious secret, the Norden Bombsight, delivering them to the German military two years before World War II started in Europe and four years before the US joined the fight. When the FBI uncovered a ring of Nazi spies in the city, President Franklin Roosevelt formally declared J. Edgar Hoover as America’s spymaster with responsibility for overseeing all investigations.