In April 2013, the three Germans -- two amateur archaeologists and a film-making accomplice -- crept inside the inner sanctum of the Great Pyramid at Giza, the last the seven wonders of the ancient world to remain relatively intact. The trio, conspiracy theorists Dominique Gorlitz, Stefan Erdmann and Peter Hoefer, wanted to show that the pyramid was not the final resting place of the pharaoh Khufu, as has long been accepted, but was in fact a relic of an even older empire. In an attempt to prove this, they scraped off part of the pyramid's cartouche -- the insignia that...