A "living" mummy haunts Biff Brewster's every step on the expedition seeking the lost tomb of Egypt's ancient Prince Reth. Fighting time to find the treasure crypt designed by Pattak the Tomb Builder, the archaeologists plead with the Egyptian government to postpone construction of a dam which will flood the site. But time is not the only enemy of the expedition. For Pattak himself -- whose mummy is missing from a London museum -- seemingly has returrned to life to oppose the violation of his masterwork!
The curator of the museum, determined to prove his theory that the "forgotten Pharaoh" was banished from the Valley of Kings, arms Biff with a precious golden scarab to guard him in the Valley of Ghosts.
Biff successfully braves the perils of the mummy's menace, only to find himself challenged by worshippers of Thoth, an even older deity of the dead, who supposedly lost the battle of the gods centuries ago.
Trapped by the duplicity of a friend, Biff uses ancient magic to extricate himself and his companions, only to learn that it takes modern miracles to keep the "mummy" from hoarding the treasure for himself alone!