The wild zone : a novel / Joy Fielding.

Enhanced descriptions from Syndetics:

From New York Times bestselling author Joy Fielding comes the suspenseful story of a seemingly casual bet among friends gone terrifyingly awry. This is how it starts. With a joke. Two brothers -- Will and Jeff -- and their friend Tom are out one night at their favorite South Beach bar, the Wild Zone, and decide to make a bet on who can be the first to seduce a mysterious-looking young woman drinking by herself. Pretty, dark-haired, blue-eyed Suzy has an innocent, almost ordinary girl-next-door way about her. "Just waiting for Prince Charming to hit on her," Jeff says. Little do they know the secrets she hides from the outside world, particularly those having to do with the daily horror she experiences under the watchful eye of her abusive husband. Little do they know she has an agenda of her own. Little do they know their harmless bet is about to take on a life of its own, a life full of deadly consequences for all concerned. Fielding is continually praised for her "heart-pounding" (Booklist) brand of storytelling, full of "chillingly satisfying twists" (People). There's certainly no going back once you've entered The Wild Zone.