Queen Elizabeth I and England's First Spymaster Sir Francis Walsingham's official title was principal secretary to Queen Elizabeth I, but in fact this pious, tight-lipped Puritan was England's first spymaster. A ruthless, fiercely lo...

In March 1941, after a year of devastating U-boat attacks, the British War Cabinet turned to an intensely private, bohemian physicist named Patrick Blackett to turn the tide of the naval campaign. Though he is little remembered today,...