Summary: 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. (imdb)

Poster submitted by Gauntlet

Genre: Mystery

Country: USA

Directed By: William Nigh

Written By: Scott Darling, Hugh Wiley

Starring: Boris Karloff, Marjorie Reynolds, Grant Withers, Huntley Gordon, George Lynn

More information at the Internet Movie Database