Martin Scorsese A mesmerizing account of World War II as fought on the home front in Great Britain by the ingenious codemakers whose work determined the life and death of the Allied agents in occupied Europe. Leo Marks, a brilliant cryptographer, is a masterful and passionate storyteller. I was immediately swept into his secret world of codes and undecipherables, trying at times (without success) to unravel the puzzles myself, and found it difficult to put down the book until the drama had come to an end. Richard Bernstein The New York Times An enthralling book, one full of an eccentric charm as well as fascinating, previously undisclosed details of the secret war waged in the occupied countries. Ken Ringle The Washington Post A welcome and powerfully affecting chapter of World War II history, and a very human story of the most clandestine and cerebral art of making war. The New York Times Book Review [A] spellbinding real-life thriller....A compelling insider's view to the shadow war: intrigue and treachery, double-dealing and deception, hope and despair, triumph and tragedy.