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...

Cast:Boris Karloff, Marjorie Reynolds, Grant Withers, Huntley Gordon, George Lynn, William Royle,

Genre:Mystery, Thriller,

country:United States of America,

Production:Monogram Pictures,