The Invisible Man Returns (1940)

Sir Geoffrey Radcliffe is sentenced to death for the murder of his brother Michael, a crime he did not commit. Dr. Frank Griffin, the brother of the original invisible man injects the prisoner with an invisibility drug. As Radcliffe’s execution nears, he suddenly vanishes from his cell. Detective Sampson from Scotland Yard guesses the truth while Radcliffe searches for the real murderer before the drug causes him to go insane.

The Radcliffe family owns a mining operation. The recently promoted employee Willie Spears is promoted within the company, stirring Radcliffe’s suspicions. After forcing Spears’ car off the road, Spears is frightened into revealing that Richard Cobb, Radcliffe’s cousin, is the murderer. After a confrontation, a chase scene ensues during which Radcliffe is struck by a bullet from Sampson. Cobb is fatally injured by falling from a coal wagon but confesses to the murder before he dies.