Caledonia. Ancient Scotland. A land ravaged by Roman invaders. One man would defy the might of the Empire. His name was Calach the Swordsman. His hatred was forged from love ... avenged with blood. A devastating winter invasion destroys everything Calach loves and drives the warrior on a course of bloody revenge. Calach has to face a professional Roman army with only a band of refugees to back him up. The Celts have the heart to fight, but hearts do not win wars — weapons of iron, shields of bronze, spear warriors, sword warriors and skilled riders with chariots win wars. With a miracle in the form of returning warriors, Calach leads a brutal insurrection that culminates in an epic battle against the hated invaders. His cunning, intelligence and valour are a match to General Agricola, the Roman Governor of Britain, who soon realizes that Calach is no ordinary foe. Will the Feather of Hawk, a mysterious gift from a young warrior woman, offer a new way forward in a world where blood and tears are sacrificed on the altar of war?