An undercover agent wrongly punished for murder is paroled to a remote tropical island with a diamond mine slave labor run by a sadistic foreigner.
Peter Lorre
as Stephen Danel
Rochelle Hudson
as Lorraine Danel
Robert Wilcox
as Mark Sheldon
Don Beddoe
as Brand
George E. Stone
as Siggy
Kenneth MacDonald
as Doctor Rosener
Charles Middleton
as Captain Cort
Stanley Brown
as Eddie
Earl Gunn
as Mitchell
Sam Ash
as Ames - Parolee (uncredited)
Raymond Bailey
as Mystery Killer (uncredited)
Trevor Bardette
as District Attorney (uncredited)
