Book excerpt: AD 264: The Roman Empire is torn in two. The western provinces - Gaul, Spain and Britain - have been seized by the pretender Postumus. To the east, on the plains of northern Italy, the armies of the emperor Gallienus muster. War is coming. Everyone must choose a side. On a mission shrouded in secrecy and suspicion, Ballista must journey The Amber Road to the far north to Hyperborea, back to his original home and the people of his birth. Yet not all welcome Ballista`s return. 'The best sort of red-blooded historical fiction' ANDREW TAYLOR