A first-person narrator recounts an expedition into remote ancient ruins, his scars and a tattoo serving as reminders of the experience. He uncovers carved stones, a hidden city, a mysterious green sphere and tunnels that lead through serpent-haunted passages, guided by prophecy and symbolic inscriptions. The party faces sorcery, monstrous sacrificial creatures and lethal rival figures as layers of secret craft and ritual practice are exposed. The tale culminates in the revelation of lost devices and symbolic knowledge that transform the narrator’s understanding of the ruins and change the course of his life.