 A knife-wielding, enigmatic Egyptian Arab Aga Ben Dragore is seeking an sacred jewel which has been stolen from an ancient tomb. The thief tells him that he sold it to Professor Morlant, a fanatical Egyptologist who fervently believes in the pagan power of the ancient Egyptian gods. Dying from a mysteriously disfiguring ailment, Morlant entrusts his faithful manservant to bandage the jewel in his hand and warns him of dire consequences if his dying wishes aren t carried out. After his burial in an Egyptian-type tomb on his estate, an anonymous robber steals the precious stone from the corpse. Although the ghastly-looking dead man rises at the next full moon to seek revenge, neither he nor the audience know which member of the household possesses the powerful jewel.