The Devil Commands is a 1941 American horror film directed by Edward Dmytryk and starring Boris Karloff, Amanda Duff and Richard Fiske.

[3] Dr. Julian Blair is engaged in unconventional research on human brain waves when his wife Helen is tragically killed in an auto accident.

The grief-stricken scientist becomes obsessed with redirecting his work into making contact with the dead and is not deterred by dire warnings from his daughter Anne, his research assistant Richard, or his colleagues that he is delving into forbidden areas of knowledge.

He is aided in his experiments by his mentally-challenged servant Karl and abetted by the obsessive Mrs. Walters, a phony medium, who believes in his work and seems to exert a sinister influence over him.

When their overly curious housekeeper discovers the truth about their experiments, her death brings the local sheriff in to investigate the strange goings on.