The cursed gem

An archaeologist is at a museum in his office examining the relics he have found in the recently discovered tomb of Tutankamon in ancient Egypt. Among the elements, there is a piece that stands out, and when he pick it up, he is automatically transported to the past, specifically to the Ancient Egypt.

When he arrives, he doesn't have the stone with him, as it is in the tomb of his owner, Tutankamon, which hasn't yet been discovered. He needs to get it back to be able to back to the present, but first he has to face various tests such as a savage gang of thieves who also want to get into the tomb.