Nine decades after Caesar failed to conquer Britannia, the Romans are back on the island, led by a determined general named Aulus Plautius. Standing against him is a tribal people.

Having marked Rome's arrival with blood, Aulus sends envoys to parlay with the tribes of Britannia, while also looking to learn more about the Druids.

Aulus is reborn, but his destiny remains unclear. Cait is able to locate her father, but she can't free him from the Roman camp alone.

King Pellanor disowns Kerra and leaves her life in the hands of the Druids. But the gods' judgement is not what he expected.

The gods have spoken, but Kerra must decide if she will accept their ruling. Antedia seals an alliance with Rome - on one condition.

After their long ordeal, Cait and her father finally arrive at the safety of the Cantii citadel, but a demon is on her trail.