Mr. Wong, Detective

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.

• 
  William Nigh
• 
  W.B. Eason

• 
  Boris Karloff
  James Lee Wong
• 
  Grant Withers
  Police Capt. Sam Street
• 
  Maxine Jennings
  Myra Ross
• 
  Evelyn Brent
  Olga Petroff / Countess Dubois / Sophie Dome
• 
  George Lloyd
  Devlin
• 
  Lucien Prival
  Anton Mohl
• 
  John St. Polis
  Carl Roemer
• 
  William Gould
  Theodore Meisle
• 
  Hooper Atchley
  Christian Wilk
• 
  John Hamilton
  Simon Dayton
• 
  Wilbur Mack
  Russell
• 
  Lee Tung Foo
  Tchin
• 
  Lynton Brent
  Tommy
• 
  Grace Wood
  Mrs. Roemer
• 
  Frank Bruno
  Lescardi (uncredited)
• 
  Ed Cassidy
  Ambulance Doctor (uncredited)
• 
  Wheaton Chambers
  Chemistry Lab Director (uncredited)
• 
  Clancy Cooper
  Warehouse Man (uncredited)
• 
  George DeNormand
  John (uncredited)
• 
  Lester Dorr
  Coroner (uncredited)