Answer
R. H. Bruce Lockhart's book, Ace of Spies: The True Story of Sidney Reilly, is credited with making Sidney Reilly a household name. The book, published in 1933, tells the story of Reilly's life as a spy, and it was a bestseller. Lockhart's book helped to popularize the image of Reilly as a dashing and adventurous spy, and it inspired numerous other books and films about Reilly.