The year is 878 and the Vikings have been thrown out of Wessex. Uhtred, fresh from fighting for Alfred in the battle to free Wessex, travels north to seek revenge for his father's death, killed in a bloody raid by Uhtred's old enemy, renegade Danish lord, Kjartan.
While Kjartan lurks in his formidable stronghold of Dunholm, the north is overrun by chaos, rebellion and fear. Together with a small band of warriors, Uhtred plans his attack on his enemy, revenge fuelling his anger, resolute on bloody retribution. But, he finds himself betrayed and ends up on a desperate slave voyage to Iceland. Rescued by a remarkable alliance of old friends and enemies, he and his allies, together with Alfred the Great, are free to fight once more in a battle for power, glory and honour.