In 6th century Britain, eight years of peace have passed since the Saxons overthrew Artorius, leader of the Britons, and forced him into exile. Learning his allies in Britain have renewed strength, Artorius returns to his homeland accompanied by his teenage son Artor. Two days later Artorius is slain by the Saxons, yet Artor's life is spared.
A mere boy in the eyes of the Saxon leader, Artor is left with Merlyn, a young man and healer who lives in self-imposed exile.
Calthorp, a Briton, carries on with Artorius' plans. He is drawn into an alliance with the druid Hwybar, and Raven, a practitioner of the black arts.
In the months ahead, perilous events force Artor to face his past and foretell a future of the great leader he will become.