A chemical manufacturer is killed just after asking detective James Wong to help him. So detective Wong decides to investigate this as well as two subsequent murders.
Boris Karloff
as James Lee Wong
Grant Withers
as Police Capt. Sam Street
Maxine Jennings
as Myra Ross
Evelyn Brent
as Olga Petroff / Countess Dubois / Sophie Dome
George Lloyd
as Devlin
Lucien Prival
as Anton Mohl
John St. Polis
as Carl Roemer
William Gould
as Theodore Meisle
Hooper Atchley
as Christian Wilk
John Hamilton
as Simon Dayton
Wilbur Mack
as Russell
Lee Tung Foo
as Tchin
