Synopsis
The owner of a coal mining operation, falsely imprisoned for fratricide, takes a drug to make him invisible, despite its side effect: gradual madness.
Cast

Cedric Hardwicke
Richard Cobb

Vincent Price
Geoffrey Radcliffe

Nan Grey
Helen Manson

John Sutton
Dr. Frank Griffin

Cecil Kellaway
Inspector Sampson

Alan Napier
Willie Spears

Forrester Harvey
Ben Jenkins

Ernie Adams
Minor Role (uncredited)

Jimmy Aubrey
Plainclothesman (uncredited)
Walter Bacon
Fight Spectator (uncredited)

Billy Bevan
Jim (uncredited)
Clara Blore
Woman (uncredited)

Stanley Blystone
Minor Role (uncredited)

Matthew Boulton
Policeman (uncredited)

Ed Brady
Policeman (uncredited)

Chet Brandenburg
Miner at Colliery (uncredited)

Louise Brien
Griffin's Secretary (uncredited)

Charles Brokaw
Minor Role (uncredited)

Jean Brooks
Minor Role (uncredited)
Tom Coleman
Miner at Colliery (uncredited)
Frank Coletti
Minor Role (uncredited)

Harry Cording
Miner (uncredited)
Paul England
Detective (uncredited)

Rex Evans
Constable Briggs (uncredited)
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