What would you do if you knew you had lived before — not once, but six times — and that only one life remained to find the soul you keep losing? At nine years old, Ion discovers a cave that shouldn't exist — hidden inside a mountain that, viewed from the right angle, resembles a silent pyramid. When he walks out, a bluish circle burns on his forearm. A mark he cannot explain, but one he recognizes — the way you recognize a voice before you see the face. Five more circles will appear throughout his life, each tied to a crossing into the past. Kael, the young giant counselor in the prehistoric Carpathians, trying to save a tribe before the flood. Alexios, the Thracian stonecutter who carves a secret symbol onto a Parthenon column for Pericles, who knows Athens will fall. Duras, King Burebista's counselor, forced to choose between saving sacred scrolls and saving the woman he loves. Maximus, the Roman tribune who sees something else in the sky above the Milvian Bridge. Radu, Vlad the Impaler's chronicler, who chooses truth on the night of the attack against Sultan Mehmed. Ștefan, Michael the Brave's captain, who loses a battle and wins something far greater. And every time, a girl with blue eyes. Always the same. Always under a different name. When Ion finds Ana in his final year of high school, only one circle remains to be completed. One door to open, deep inside the pyramid-mountain. But beyond it, two parallel futures await — one where humans and artificial intelligences have learned to live together, another where they have chosen war. And Ion understands, for the first time in eight thousand years, that the choice he makes now is not only his own. Eternal Mystery is the first volume of a historical-fantasy epic that weaves the real history of Dacia, ancient Greece, the Roman Empire and the Romanian principalities with a profound meditation on reincarnation, choice, and love as a force that crosses time. For readers who love Susanna Clarke, V.E. Schwab, Carlos Ruiz Zafón, and David Mitchell. Eight thousand years. Six lives. One door remaining. The story continues in Volume II.