A single spy can save thousands of lives. Spies and secret agents have been hard at work for centuries, risking their lives, and sometimes changing the course of history. Discover twenty-seven of the most courageous and daring, including Britain's first female spy, a teacher turned saboteur, the spy who sang for Hitler and the man who never was . . . An unputdownable collection of real life adventures, stunningly illustrated by Terri Po.