Grace and Leo impetuously take their vows at a Central Park wedding that is a ratings stunt hosted by Today's Katie Couric. Grace's pals, especially Will, are hurt that they weren't invited, but all seems forgiven when everyone-including Grace's outspoken mom and the subdued Mrs. Marcus-gather days later for a swank reception. It should be a festive bash, but the emergence of unsettling details about Leo-and about the park nuptials-give Grace reason to wonder whether she has made a mistake.