In the dying days of the Roman republic, Military Tribune Marcus Fabius Aquila of the VIIth Legion drops a silver coin on the ramparts of Cado's Burg, a hilltop fortress in south west Britannia. What is he doing there - a Roman soldier - eighty years before Britannia is invaded by the troops of the Emperor Claudius? In 1966, some two thousand years later, the coin is discovered by Lynette Mason, a seventeen year old girl volunteering on an archaeological...