Graham Greene's 1943 novel. A recluse, recovering from the death of his wife, tries to pull himself out of his lonely misery and re-enter life. He goes to a church fair and accidentally makes the winning guess of the weight of a cake. By doing this&he enters through an invisible door into a world of espionage, conspiracy and betrayal. Wartime London is not merely a teeming besieged city but an underworld of shadows. You can love someone, but can you ever trust them?