There exists a secret, hidden for thousands of years, that will forever change our understanding of the meaning and pupose of the most fascinating wonder of the Ancient World:  the Pyramids of Egypt.  What purpose did these massive structures, one of the largest construction projects ever undertaken, serve?  Why were they scaattered across the desert in a seemingly random pattern?  The mystery deepened when, in 1993, a secret door within the Great Pyramid was discovered--a door unopened for 5,500 years. Robert Bauval and Adrian Gilbert have uncovered the key to the plan that governed the construction of the pyramids.  A dramatic combination of history and meticulous detective work, The Orion Mystery provides a stunning conclusion to one of the world's greatest mysteries.