It's 1938. Arthur Lake, a slightly goofy young actor hoping for his big break, gets a lucky invitation to a lavish Halloween party. It's hosted by Marion Davies and William Randolph Hearst at their famous San Simeon castle.
Marion's 17-year-old niece, Patricia Van Cleve, craves the narcissistic movie star Errol Flynn, who has been invited along with his current squeeze, Bette Davis.
The hosts are enraged when they find Van Cleve and Flynn together in bed. But Van Cleve rebelliously insists she can do whatever she wants, and longs to run away with Flynn.
To avoid a scandal, W.R. and Marion concoct "It's a Four-Step Plan" to persuade Patricia to marry her off as soon as possible to the nearest decent bachelor at hand--namely Arthur Lake. Can they bend Patricia and Arthur to their wills? They've barely met and don't get along.
The party climaxes when Orson Welles’ “War of the Worlds” broadcast incites panic. Now the guests playfully grab lampshades and furnishings to dress up for the "March of the Martians." Will this crazy happenstance be a matchmaker?