When two mysterious deaths mar an otherwise pleasant weekend in the English countryside, unflappable flapper Lady Eileen Brent (Cheryl Campbell) teams up with the dashing Jimmy Thesinger (James Warwick) to solve the dastardly deeds. Their sleuthing leads them into a world of espionage and international intrigue as they discover a secret society known as "The Seven Dials" and the attempted theft of top-secret government documents. Based on an early novel by Agatha Christie, this Jazz Age mystery blends high suspense with lighthearted humor and features a fine supporting performance from Sir John Gielgud.