Watch VoirFilms. By mid-1940, Hitler had conquered all of Northern Europe and now Britain was under seige by air and U-boat; something had to be done or defeat was inevitable. Winston Churchill established an eccentric group of codebreakers at Betchley Park comprised of British and American mathematicians, chess and crossword fanatics and even students to unlock the secrets of the Nazi's encryption device, the Enigma. Written by M. Gosse