Dr. Toddy MacFarlane (Henry Daniell) needs cadavers for his medical experiments, ultimately intended to treat a young disabled girl. However, they are not easy to come by, so he enlists the help of taxi driver John Gray (Boris Karloff) and his assistant, Joseph (Bela Lugosi), to unearth bodies from the cemetery. When Donald (Russell Wade), Dr. MacFarlane's assistant, recognizes one of the corpses Gray delivers, the true source of the bodies is called into question.