In the sixth year of Bridei's kingship, he sends his chief assassin and spy, the Gael Faolan, back home to Ireland to investigate reports of a powerful Christian cleric whose charismatic leadership may prove a threat to the stability of Bridei's pagan kingdom of Fortriu. Years ago, the action of a cruel chieftain caused the young Faolan to deal with a shattering blow to his own family, forcing him to leave home for good. Now he must return and face his demons...