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

Cedric Hardwickeas Richard Cobb
Vincent Priceas Geoffrey Radcliffe
Nan Greyas Helen Manson
John Suttonas Dr. Frank Griffin
Cecil Kellawayas Inspector Sampson
Alan Napieras Willie Spears
Forrester Harveyas Ben Jenkins
Ernie Adamsas Minor Role (uncredited)
Jimmy Aubreyas Plainclothesman (uncredited)
Milton Krasner