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
Larry O'Day
Harley Wood
Barbara Hartwell
Don Barclay
Lucky Smith
Karl Hackett
Obed Young
Horace Murphy
Sheriff
Miki Morita
Chan Lee
Perry Murdock
Jim Barton
John S. Peters
Dr. Von Kurtz
