An ancient treasure map. A baffling riddle. A secret room beneath the Great Sphinx. As archaeologist Tom McCroy and his nephew, Lorton, prepare to map a recently discovered passageway that leads beneath the famous stone statue, little do they realize the danger that awaits. Hidden within the ancient catacombs is something incredible...and something terrible. Now with time running out, will the legendary Sphinx give up its greatest secret...and will Lorton and Tom survive long enough to find it?