As a divorce lawyer for Manhattan’s elite, David Greenfield is privy to the intimate, dirty details of failed marriages. He knows he’s lucky to be married to Blair, who he loves more today than he did when they tied the knot. Then seductive photographer Jean Coin asks David to be her lover for six weeks, until she leaves for Timbuktu. Tempted, David reasons that “it’s not cheating if your wife’s there.” A one-night threesome would relieve the pressure of monogamy without wrecking their marriage. What harm could come of fulfilling his longtime sexual fantasy?