Directed by Phil Rosen | Starring: Sidney Toler, Mantan Moreland, Arthur Loft, Gwen Kenyon

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).