There must have been a Civilization One: a highly advanced precursor to what is currently the earliest recognized civilization. That’s the astounding revelation from a powerful duo of writers that includes the author of the bestselling The Hiram Key. Christopher Knight and Alan Butler’s startling conclusion comes from their quest to crack the mystery of the ancient "megalithic yard"—an incredibly precise unit of measurement that’s based on a deep understanding of the solar system. It seems beyond the comprehension of the supposedly unsophisticated people of Stone Age Britain, and yet not only is it visible in the thousands of megalithic structures built in Britain and France, but this measurement keeps recurring throughout nature and science. The implications of the authors’ breakthrough discovery go far beyond the idea of a super-science or prehistory: they indicate a grand plan that will have far-reading theological ramifications.