With all due respect to Mr. Furst, I think we can do a bit better than rum and Coke.Graham Greene’s work must be included in any survey of top-rank spy novels, and “Our Man in Havana” may be his best. The problem here is Hollywood: Just as you can’t read Greene’s “The Third Man” without thinking of Orson Welles, “Our Man in Havana” instantly brings to mind Alec Guinness, followed closely by the sublime Ernie Kovacs. But the book itself is a marvel, making fun of the espionage business while still remaining a spy novel. It brings ample suspense and expertly wrought ambience to its tale of a British vacuum-cleaner salesman in Cuba who reluctantly agrees to become an MI6 agent. He begins filing fanciful reports—including sketches of a secret military installation based on a vacuum-cleaner design—that the home office takes all too seriously. “Our Man in Havana” is a honey of a beach read, best served with rum and Coke.