Walter Schellenberg: The Memoirs of Hitler's Spymaster
"'Whenever I was on missions abroad I was under standing orders to have an artificial tooth inserted which contained enough poison to kill me within thirty seconds if I were captured. To make doubly sure, I wore a signet-ring in which, under a large blue stone, a gold capsule was hidden containing cyanide.' - Walter Schellenberg 'The interest of this book lies in the rich assortment of 'cloak and dagger' stories, some of them so fantastic that they could only have taken place in the world of the Nazis, and in the picture of the sinister, bloodthirsty world of the Gestapo.' - William L. Shirer"