The Last Cambridge Spy: John Cairncross, Bletchley Park Mole and Soviet Agent

The first biography of John Cairncross, the fifth member of the Cambridge spy ring and colleague of Alan Turing

John Cairncross was among the most damaging spies of the twentieth century. A member of the infamous Cambridge Ring of Five, he leaked highly sensitive documents from Bletchley Park, MI6 and the Treasury to the Soviet Union – including the first atomic secrets and raw decrypts from Enigma and Tunny that influenced the outcome of the Battle of Kursk. In 2014, Cairncross appeared as...