On the eve of World War I, Ellie Dunn, her father, and her fiancé are invited to one of Hesione Hushabye's infamous dinner parties. Unfortunately, her fiancé is a scoundrel, her father's a bumbling prig, and she's actually in love with Hector, Hesione's husband. This bold mix of farce and tragedy lampoons British society as it blithely sinks towards disaster.