A fourth novel (after The Club, 1995, etc.) from Heller (whose name may or may not have inspired her novel's witty hook) puts a devilishly zany spin on the hard-to-enliven subject of midlife crisis. Things couldn't get much worse for real-estate agent Barbara Chessner of 666 (yes, that's 666) Seacrest Way, Banyan Beach, Florida. A bottle of wine has become her nightly norm; she can't sell a house to save her life; and, at 38, she's already gray-haired and dumpy. One night in the midst of a powerful thunderstorm her misery reaches its peak: Mitchell, her husband of ten years (whom she doesn't even love), dumps her for bucktoothed but blond and busty local weatherperson Chrissy Hemplewhite. On top of everything else, Barbara's suddenly all alone. So she does the only thing she can do: She strikes a midnight-hour deal with the devil. The catch is that she doesn't know what she's done: She thought she was praying to God when she called out to the stormy ocean, ""I'll do anything if you'll help me."" When Barbara shows up at work the next morning, her stomach is newly flat, her hair is suddenly blond and smooth, her bustline is mysteriously enhanced, and she's acquired a certain je-ne-sais-quoi that has her officemates deeply puzzled. Life picks up all around: She makes an immediate, significant sale to David Bettinger, a former short, fat, bald orthodontist and current stud who turns out to be another ""darksider."" He gives Barbara the score when in the heat of passion she discovers that he has a tail. Meanwhile, Jeremy Cook, her brother Ben's best friend, becomes rather more than an acquaintance, and her loyal dog Pete turns out to be much more than man-or woman's-best friend. Campy, over the top, down-and-dirty, and a whole lot of fun.