Long forgotten by the world above, Nodens—the ancient god of the deep and the hunt—walks once more upon the storm-lashed shores of the living. Eira, a young healer haunted by her past, is drawn to his realm by forces older than memory. What begins as a search for truth soon binds her fate to that of a god abandoned by men and feared by his own kind. But Rome's shadow falls across the western isles. As legions carve their mark into sacred lands, old powers stir, and alliances are tested. To save both mortal and divine, Eira must decide what must endure— and what must be surrendered.