Used book – The Glass Formula, Kai Meyer, Françoise Périgaut

Merle, a fourteen-year-old orphan, lives in a strange universe. In this world, the Devil truly exists, and the resurrected Pharaoh's Egyptian armies, riding their solar boats, are conquering the world; the Queen of the Waters, a spirit who once protected Venice, had to escape with Merle and the flying stone lion Vermithrax. After fleeing Lord Light's underworld realm, Merle and her companions find themselves in the middle of the Egyptian desert, covered in a thick layer of snow. They take refuge in a solar boat that will lead them to the Iron Eye, the fortress of the sphinxes. As for the sphinxes, ever since they took control of the Empire and recovered the giant god buried in the Venetian lagoon, they are determined to conquer the worlds behind the mirrors as well. Thrust into the heart of the decisive confrontation between the ancient gods and the new tyrants, Merle, with the help of her blind friend Junipa, who can pass behind mirrors thanks to the Glass Formula, will discover the truth about her origins and her destiny - a destiny tragically linked to the secret of the Queen of the Waters...