'The Orion Mystery' is the story of a secret, hidden for thousands of years, that will forever change our understanding of the meaning and purpose of a 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 scattered across the desert in a seemingly random pattern? The pyramid mystery deepened when, in 1993, researcher Rudolf Gantenbrink discovered a secret door within the Great Pyramid - a door unopened for 4,500 years. Robert Bauval has spent ten years investigating the pyramids themselves and the Pyramid Texts, the oldest writings known to mankind. In this book, he and Adrian Gilbert reveal the key to the plan that governed the construction of the pyramids.