Tom Keene plays Tom Keene. He is an American agent of some description, sent to Macao to pursue suspected gunrunner Cornelius Keefe. He falls in with Wera Engels, who is dumping Keefe, because he is keeping secrets from her.
Keene is nominally aided by Warren Hymer who, like most of his movie roles, is of no use to anyone. He spends a lot of his time cracking eggs. Although it's interesting, I suppose, to see Keene in a lead role which does not include a horse, this movie looks as if it is a three-reeler that the producer, exploitation specialist Walter Futter, expanded by means of news reel footage from Hong Kong that he picked up on the cheap and had his unnamed editor cut into the movie. There is a sequence in which several of the principals talk in the middle of a polo match that is very poorly paced.
Tetsui Komai is present because, presumably, they needed an actor who matched his general description. Tom London is there. I suppose Keene told him he had a leading role and London showed up thinking it would be a western.