Quoting Mutt Jones1865
Well spread out, but you might want to explain the story of the set in your creation info for people like me who have no idea what happens here!
Basically, Indy is searching for the four missing parts of the Infernal Machine, a device held beneath the Etemenanki (Tower of Babel) in Babylon. He had three, but was captured by the Russians. He overhears one of them talking about the Kingdom of Kush as he escapes, so he sets off for the Nubian city of Meroe, in Sudan. After solving the (awesome) riddle of the pyramids, he enters King Solomon's Mines where he must find three gems called King Sol's Jewels, that open the entance to King Nub's Tomb, where the last Machine Part is held.