The human factor Graham Greene

Home from the colonies (South Africa), Castle is now a minor functionary in British Intelligence, a middle-aged man devoted to his black wife Sarah and her young son. Castle lives in "angst": a double agent, he leaks information to the Communists. Castle's superiors suspect Davis, Castle's woebegone office mate hungering for romance

but the reader knows early that Castle is the traitor. The narrative is built on Greene's familiar structure: the respected man, secretly living outside society's laws, finally caught by the corrupted law of that society. The reader's sympathies are with the outlaws

a basically decent human being who does the wrong thing for the right reasons.