Cambridge Archaeology Professor Alex Harker is drawn back into the twisted clutches of the Mithras, who are seeking to unearth a knowledge lost to humankind since the dawn of civilisation. His journey will take him from the Bay of Bengal to the murky depths of the Gibraltar strait, from the Swiss Alps to an island untouched for over 30,000 years, all in pursuit of this fateful knowledge. In a diabolical game of cat and mouse that will push every fibre of his convictions to breaking point, Alex will strive to find the answers to human existence itself, which lie hidden behind the greatest secret of all.