Mr. Wong, Detective (1938)

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http://www.archive.org/details/Mr._Wong_Detective

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http://www.archive.org/download/Mr._Wong_Detective/Mr._Wong_Detective_512kb.mp4

When a chemical manufacturer is killed after asking detective James Wong to help him, Wong investigates this and two subsequent murders. He uncovers a international spy ring hoping to steal the formula for a poison gas being developed by the first victim's company.

Stars Boris Karloff, Grant Withers and Maxine Jennings

The Mr. Wong series of films

Mr. Wong, Detective
The Mystery of Mr. Wong
Mr. Wong in Chinatown
The Fatal Hour
Doomed to Die
Phantom of Chinatown

http://www.imdb.com/title/tt0030473/