Britain, AD 75. Quintus, long exiled from his people, has travelled great odysseys in the retinue of a powerful Roman. Though a citizen of nowhere, is a man of reason, fluent in many languages. Olwen, imperious tribal royalty, is rooted in her native land – a volatile warrior, fiercely attached to the natural world. Given away by her father as part of a peace treaty, Olwen flees during the night, taking Quintus with her. Hunted by an army, the two make their way across the country, living off the land, heading for the western shore.