Design for murder

A young playwright and an attractive interior designer find themselves suspects when the unhappily married wife of a prominent Senator is found murdered. Attending Mrs. Kirby's house party, Stephen Ransom and Ann Vickery struck up a conversation, and Stephen jokingly outlined a plot for a mystery play that might take place in the Washington mansion's setting. After Mrs. Kirby is found dead, Stephen and Ann must join forces to clear their name, under the watchful eye of Inspector Duveen.