In the two years since the last Charlie Chan feature film (''Castle in the Desert''), Charlie Chan is now 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). Also involved in the case is the bumbling and easily frightened Birmingham Brown (Mantan Moreland) who works as a limo driver for one of the suspects.
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