Back on her native land, Celtina resumes her slow descent towards the south with the firm intention of finding her mother and her little brother, slaves of the Roman Titus Ninus Virius. Meanwhile, among the gods, everything goes from bad to worse. Nuada, the supreme king, must face the Fir-Bolg, formidable enemies who refuse to cede part of their territory to him. Severely injured in the battle, Nuada is also weakened by the loss of the magic garnet from his Sword of Light, the invincible Caladbolg. And all this at the very moment when the Fomorians take advantage of the weakness of the Thuatha DÔe Danann to attack both the gods and the Celts.