Jay McInerney's new novel seems from the outside to be composed of the most disheartening elements: The Good Life is about a group of privileged New Yorkers who are led to reassess their lives and become in many ways better people in the wake of the 9/11 attacks. The plot premise seems so pat and topical that the reader is likely to take fright. But there is mercifully no need. It is a tribute to McInerney's many talents that he can wrest from his schematic structure a novel that is both tender and entertaining.As often in McInerney's world, we find ourselves among a wealthy and ambitious elite, whom the novelist seems both intensely drawn to and repelled by. The focus is on two New York couples: Russell (publishing) and Corinne (screen writing), Luke (ex-banker) and Sasha (charity). McInerney brings an amusingly bitchy eye to bear on their lifestyles (for example, a character's double-height living room is described as appearing "to be holding its breath, as if awaiting a crew from Architectural Digest"). He keeps track of their snobbery and their social one-upmanship with all the attention to detail of a seasoned society columnist.