When the manor Chimneys is rented out to a wealthy man and his wife, they are joined by a group of young men and women for a weekend. On a prank, the group decide to each leave an alarm clock in the room of one of the men who has trouble waking in the morning. There were eight clocks so put but the next day the man is dead and one of the clocks is missing. Eileen Brent becomes determined to learn who killed the man and why the missing clock. She will become involved in several murders and a missing formula.