Glamorous but pretentious Oyster Bay, Long Island socialite Tracy Samantha Lord is planning a lavish June 1938 wedding to an equally pretentious executive, George Kittredge. Guests include her mother, grumpy little sister Dinah, and absent-minded Uncle Willy, who lives in a house near the Lord estate. Willy is hosting a party for the wedding guests that evening, the night before the wedding. Tracy's unwelcome ex-husband and neighbor, C.K. Dexter Haven, sails up to the estate in his yacht. Dexter informs Tracy and her family that tabloid reporters Mike Connor and Liz Imbrie will be covering the wedding for "Spy" while pretending to be guests. Dexter invited them to stop "Spy" from publishing an exposé of Tracy's father Seth, who is estranged from Tracy's mother because he is having an affair with a dancer, Tina Mara. Dexter tries to convince the suspicious Dinah of his good intentions.