In the middle of a pictorial lecture on his recent expedition to the Mongolian Desert, Dr. John Benton,the famous explorer, drinks from the water bottle on his lecture table, collapses and dies. His last words "Eternal Fire" are the only clue Chinese detective Jimmy Wong and Captain Street of the police department have to work on.
Keye Luke
as James Lee Wong
Lotus Long
as Win Lee, Benton's Secretary
Grant Withers
as Police Captain Street
Charles Miller
as Dr. John Benton / Cyrus Benton in Newspaper (as Charles Miller)
Huntley Gordon
as Dr. Norman Wilkes
Virginia Carpenter
as Louise Benton
John Dilson
as Charlie Frasier
Paul McVey
as Detective Grady
John Holland
as Mason
Richard Terry
as Toreno
Robert Kellard
as Tommy Dean
Willy Castello
as Jonas
