"“Professor Calthrop, actuated only by scientific motives, and his assistant, out for his own gain, have invented a system for the manufacture of diamonds.” - BFI."
Noel Madison
as Joseph
James Stephenson
as Ben
Lesley Brook
as Helen Calthrop
Wilfrid Lawson
as Gallanie
George Galleon
as Tony
Renee Gadd
as Marianne
Philip Ray
as Tompkins
Hector Abbas
as Nichols
Wally Patch
as Alf Higgins
J. Fisher White
as Prof. Calthrop
Dino Galvani
as
James Regan
Ralph Ince
Director
Irving Asher
Executive Producer
Michael Barringer
Script
Anthony Hankey
Basil Emmott
Director of Photography
Frank Richardson
Screenstory