Book excerpt: For everyone who’s ever wondered what it really takes to be a spy, legendary author Graham Greene (The Third Man, The Quiet American) and his brother Hugh have compiled this irresistible selection of fiction, memoir, and tricks of the trade straight from the all-time masters of espionage. Here is a perfectly safe way to discover the dangerous secrets many spies have died to learn. Want to know how to hide a map of an enemy fort in a butterfly sketch? Wonder why James Bond himself advises always drinking vodka with pepper? Who hasn’t fantasized about being a secret agent or been captivated by the mysterious lore of spycraft? From the words of William Blake, D. H. Lawrence, and Thomas Mann—all suspected of spying in three great wars—to classic espionage stories by Joseph Conrad, Rudyard Kipling, Eric Ambler, Ian Fleming, and Graham Greene himself, this fascinating compendium of all things spy makes the perfect companion for the armchair agent in all of us. If this book divulged any more secrets, it would’ve had to be written with invisible ink. (Find out how to make your own inside!) From the Trade Paperback edition.