A Celtic warrior girl is held captive and enslaved by a rival tribe. When fever takes her only friend she knows she must escape, but she runs straight into the path of two Roman foot soldiers. Thinking they will kill a warrior instantly, the girl disguises herself as a beggar and asks to share their fire. Using her gift as a seer she discovers that one of the soldiers is not what he seems. Celtic blood courses through his veins too, but there is something else. He is a shapeshifter - a Versipellum. He shares his soul with that of the wolf. The girl needs to reach the leader of her dead friend's tribe, and the boy must escape the Romans before they discover his true nature. Their only chance of survival is to help each other. But what will happen when their powers are combined?