Debut historical fiction series vividly recreating the rise of the Christian kings of Northumbria, England In 604 AD, Edwin, the deposed king of Northumbria, seeks refuge at the court of King Raedwald of East Anglia. But Raedwald is urged to kill his guest by Aethelfrith, Edwin's usurper. As Edwin walks by the shore, alone and at bay, he is confronted by a mysterious figure—the missionary Paulinus—who prophesies that he will become High King of Britain. It is a turning point. Through battles and astute political alliances Edwin rises to power, in the process marrying the Kentish princess Aethelburh. As part of the marriage contract the princess is allowed to retain her Christian faith. But, in these times, to be a king is not a recipe for a long life. This turbulent and tormented period in British history sees the conversion of the Anglo-Saxon settlers who have forced their way on to British shores over previous centuries, arriving first to pillage, then to farm and trade—and to come to terms with the faith of the Celtic tribes they have driven out. The dramatic story of Northumbria's Christian kings helped give birth to England as a nation, English as a language, and the adoption of Christianity as the faith of the English.

The exiled family of King Aethelfrith of Northumbria arrive, after much hardship, on the island of Iona, where the monastery founded by St Columba has become a centre of worship and learning. Young Oswald becomes firm friends with a novice, Aidan. When Aidan professes his final vows, Oswald and his little brother Oswy are received into the church. As befits a young prince, Oswald learns to fight. However, Aidan's example attacts him and he is on the point of deciding to become a monk when news reaches Iona that his half brother, Eanfrith, has been killed by Cadwallon, the king who defeated Edwin. Oswald sails back to Northumbria and meets Cadwallon in battle, defeating and killing him. Oswald, now undisputed king of Northumbria, gives Aidan the island of Lindisfarne as his base. But Penda, the last great pagan king in England, is raising troops against him ...

In the third entry chronicling the rise of Christian kings in Britain, Oswald dies and the great pagan king Penda becomes overlord in his place. To stand against the increasingly powerful Penda, Oswiu, king of Bernicia, tries to unite the smaller neighboring kingdoms by marrying a daughter of Deira. But the struggle for power leads Oswiu to order the assassination of the king of Deira. He wins the throne but loses the approval of the people. In atonement, he establishes a monastery at the site of the slaying. What will happen when Oswiu and High King Penda at last meet in battle? Though the kingdom may become politically one, both the Celtic and Roman strands of Christian faith vie for supremacy, mirroring the king's own struggle for power.