In the sacred city of Abydos, a glimmer breaks into the darkness, Enak has just opened a box containing his son's bones. Suddenly, he is stunned. Mysterious priests are present at his awakening. They promise Enak a cure for the evil that eats him. In exchange, he will have to find the city of the Atlanteans, these legendary men with immense knowledge. Joined by Alix and Tefnout, they embark on the quest for the mythical Atlantis. Together, they will have to go up to the sources of the Nile to find the gates of the engulfed city.