Lionel Twain invites the world's five greatest detectives to a 'dinner and murder'. Included are a blind butler, a deaf-mute maid, screams, spinning rooms, secret passages, false identities and more plot turns and twists than are decently allowed.
While visiting the circus with his family, Charlie is recruited by the big top's co-owner to investigate threatening letters that he's received.
After receiving congratulations from the Home Secretary for solving his most recent case, Charlie is sought out by Pamela Gray, a beautiful but desperate young socialite whose brother Paul awaits execution for the murder of a weapons inventor. She is so convinced of his innocence that she becomes distraught when she overhears Neil Howard, her brother's lawyer and her fiancee, confide to the detective his belief in his client's guilt. Angered at this disclosure, she returns his ring and breaks off the engagement. Although the execution will take place in 65 hours, Charlie pledges to expose the murderer. All potential suspects are reassembled in the country mansion of family friend Geoffrey Richmond, where the murder took place, as Charlie tries to expose the real murderer before time runs out.
Famous detective Charlie Chan is called out of retirement to help a San Francisco detective solve a mysterious series of murders. With his bumbling grandson as his sidekick, Chan also encounters an old nemesis known as the Dragon Queen who is the prime suspect.
Charlie impersonates an employee of the U.S. government to foil an espionage plot which would destroy part of the Panama Canal, trapping a Navy fleet on its way to the Pacific after maneuvers in the Atlantic.
Chinese sleuth Charlie Chan (Sidney Toler) discovers a scheme for the theft of government radar plans while investigating several murders.
Paul Manderley, eccentric historian, and his wife, descendant of the Borgias, live in an isolated castle-like mansion in the Mojave Desert. When a guest suddenly collapses, Charlie Chan is invited to stay. As the standard mystery-mansion props come into play, and all means of outside communication are sabotaged, it becomes evident that one of the inhabitants has access to poisons and is prepared to use them...
Charlie Chan is an agent of the U.S. government working in Washington DC and he is assigned to investigate the murder of the inventor of a highly advanced torpedo. Aiding Chan is his overeager but dull-witted Number Three son Tommy (Benson Fong) and his Number Two Daughter Iris Chan (Marianne Quon).