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.
A dangerous amnesiac escapes from an asylum, hides in the opera house, and is suspected of getting revenge on those who tried to murder him 13 years ago.
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).
When a friend of Charlie's is found kicked to death by his own race horse on board a Honolulu-bound liner, the detective discovers foul play and uncovers an international gambling ring.
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...
Movie star Shelah Fane is seeing wealthy Alan Jaynes while filming in Honolulu, Hawaii, but won't marry him without consulting famed psychic Tanaverro first. Tanaverro confronts her about the unsolved murder of fellow film star Denny Mayo three years earlier, and she decides to reject Jaynes' proposal. When Shelah is found shot to death in her beach-front pavilion, Charlie Chan of the Honolulu Police investigates.
While investigating the theft of antiquities from an ancient tomb excavation , Charlie discovers that the body of the expedition's leader concealed inside the mummy's wrappings.
Charlie's investigation of a phony psychic during the 1939 World Exposition on San Francisco's Treasure Island leads him to expose a suicide as murder.