When the esteemed detective takes his honorable wife and all twelve children on an outing to the circus, he soon discovers that the main attraction is a baffling case of murder. With the help of his eldest son, Chan investigates.
This mystery pits Charlie Chan against international spies who are using the Berlin Olympic games as the perfect cover for cold-blooded murder. The detective is aided by his son who just happens to be on the U.S. swim team.
Charlie Chan investigates two murders on the opening night of an opera. The prime suspect is the husband of the star of the opera, himself a talented singer who recently escaped from the insane asylum where he had suffered from amnesia for years.