Using his own long experience as a professional archaeological surveyor & after five years patient computer-reanalysis of the earthwork & stone circle, Anthony Johnson reveals in this brilliantly argued detective story how he solved the key mystery of Stonehenge. Locked within the symmetry of the stones are precise formulae which determine their numbers, spacing & relationships. As a result of this revelation, the whole rationale behind Stonehenge & other major prehistoric sites can be reassessed.