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Plot
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.
Where to watch Mr. Wong, Detective?
Mr. Wong, Detective is a crime movie featuring Boris Karloff and directed by William Nigh.
Mr. Wong, Detective is currently streaming for free (ad-supported) on Public Domain Movies and it's also available on Amazon Prime Video, Fandor Amazon Channel, FilmBox+, Pure Flix and The Film Detective.
It is also possible to buy Mr. Wong, Detective on Amazon Video.