From IMDb: 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.

Date : 1938
Cast : Boris Karloff as Mr.

James Lee Wong
Grant Withers as Captain Sam Street
Maxine Jennings as Myra Ross, Dayton's Secretary
Evelyn Brent as Olga Petroff / Countess Dubois / Sophie Dome
George Lloyd (actor) as Detective Lt.

Devlin
Lucien Prival as Anton Mohl, aka Baron Von Krantz
John St.

Polis as Carl Roemer, Poison Gas Inventor
William Gould (actor) as Theodore Meisel, Dayton's Partner
Hooper Atchley as Christian Wilk, Dayton's Partner
Neil Hamilton (actor) as Simon Dayton, President Dayton Chemical Co.
Wilbur Mack as Russell, Dayton's Office Manager
Lee Tung Foo as Tchin, Wong's Servant (as Lee Tong Foo)
Lynton Brent as Detective Tommy
Grace Wood as Mrs.

Carl Roemer