Mr. Wong in Chinatown 1939

Synopsis:

A pretty Chinese woman, seeking help from San Francisco detective James Lee Wong, is killed by a poisoned dart in his front hall, having time only to scrawl "Captain J" on a sheet of paper. She proves to be Princess Lin Hwa, on a secret military mission for Chinese forces fighting the Japanese invasion. Mr. Wong finds two captains with the intial J in the case, neither being quite what he seems; there's fog on the waterfront and someone still has that poison-dart gun...

Directed by: William Nigh
Written by: Scott Darling
Runtime: 71 minutes
Related titles:
Cast:
Boris Karloff
Boris Karloff
Mr. James Lee Wong 
Marjorie Reynolds
Marjorie Reynolds
Roberta 'Bobbie' Logan 
Grant Withers
Grant Withers
Police Capt. Bill Street 
Huntley Gordon
Huntley Gordon
Mr. Davidson 
George Lynn
George Lynn
Capt. Guy Jackson 
William Royle
William Royle
Capt. Jaime