Download or read book Joan Clarke - the Biography of a Bletchley Park Enigma written by Anthony J. Randall and published by . This book was released on 2019-09-20 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The life of Joan Clarke, who worked alongside Alan Turing at Bletchley Park decrypting the German Enigma machine in World War 2. Having been recruited by GC&CS at the beginning of the war, Joan stayed with what then became GCHQ until well past retirement age. She worked on the unmasking of Philby, Burgess and Maclean during the Cold War.