Cowboy Larry O'Day and his sidekick Lucky Smith happen upon a distraught Barbara Hartwell, who is about to be arrested for the murder of her uncle. With Barbara behind bars, Larry is determined to find the real killer and soon finds himself in the middle of a mystery involving crazed German entomologists and a smuggling ring bringing Chinese "picture girls" across the Mexican border for sale to wealthy Chinese bachelors.
Bob Steele
as Larry O'Day
Harley Wood
as Barbara Hartwell
Don Barclay
as Lucky Smith
Karl Hackett
as Obed Young
Horace Murphy
as Sheriff
Miki Morita
as Chan Lee
Perry Murdock
as Jim Barton
John S. Peters
as Dr. Von Kurtz
Frank Ball
as Professor Andrew Hartwell
