Darius Lucilius, former Roman Commander, has turned his back on the Empire for a life with Fionn, a powerful and enigmatic Celtic king. But their fledgling union, as well as Fionn’s kingdom, is threatened by a dangerous enemy. Equipped with Roman weaponry, the Robogdi are allies no longer and seek the destruction of Fionn and his tribe. Forced to accept an uneasy alliance with Decimus Seuthes, a Roman Commander and master negotiator with his own plan for Hibernia, Fionn and Darius must head off a deadly war before it begins. But in striving to save his people, Fionn draws ever closer to losing himself.