An 18th-century surgeon needs dead bodies to experiment on to expand his knowledge of medical science, so employs a cab driver to secretly provide them. The grave robber takes to blackmailing him, and his conscience is troubled when he realises the corpses are being obtained through murder. Horror, with Henry Daniell, Boris Karloff, Russell Wade and Bela Lugosi.

Edinburgh, 1831. Among those who undertake the illegal trade of grave robbery is Gray, ostensibly a cab driver. Formerly a medical student convicted of grave robbery, Gray holds a grudge against Dr. MacFarlane who had escaped detection and punishment.