Christine Granville, G.M., O.B.E. and Croix de Guerre, one of the most successful women agents of the Second World War and said to have been Churchill's 'favourite spy', was murdered, aged 37, in a London Hotel in 1952. Her actions as a British secret agent in Poland, Hungary and France were legendary even in her lifetime and she repeatedly risked her life to undertake dangerous missions. Her exploits began after the fall of Poland when she became a British agent; organising the escape of British prisoners-of-war, Polish pilots and refugees and returning to Poland, her homeland, to set up...