books.google.ch - In 1942, with a black-market chicken tucked under his arm by his mother, Leo Marks left his father's famous bookshop, 84 Charing Cross Road, and went off to fight the war. He was twenty-two. Soon recognized as a cryptographer of genius, he became head of communications at the Special Operations Executive...http://books.google.ch/books/about/Between_Silk_and_Cyanide.html?hl=de&id=I4zP8hSxIFIC&q=knew&utm_source=gb-gplus-shareBetween Silk and Cyanide
