In the bitter winter of a.d. 44, the Roman troops in Britain are impatiently awaiting the arrival of spring so that the campaign to conquer the island can be renewed. But the native Britons are growing more cunning in their resistance, constantly snapping at the heels of the mighty Roman forces.

When the most brutal of the native tribesmen, the Druids of the Dark Moon, capture the shipwrecked wife and children of General Plautius, quick action is called for. Two volunteers from the crack Second Legion must venture deep into hostile territory in a desperate attempt to rescue the prisoners.