Charlie Chan is an agent of the US 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 son Tommy and his daughter Iris.

Sidney Toler
as Charlie Chan

Mantan Moreland
as Birmingham Brown

Arthur Loft
as Inspector Jones

Gwen Kenyon
as Inez Arranto

Sarah Edwards
as Mrs. Hargue

George J. Lewis
as Paul Arranto

Marianne Quon
as Iris Chan

Benson Fong
as Tommie Chan

Muni Seroff
as Peter Laska

Barry Bernard
as David Blake
CinemaSerf
I found the dynamic for these mysteries was rarely better than when our Hawaiian detecting duo was father and No.2 son "Jimmy". This first Monogram production involves the weaker supporting character of "Tommy" (Benson Fong) as well as his sister "Iris" (Marianne Quon) and a debut from the inimitabl...