The Crystal of Atum. Aki and the Spheres of TimePaperback, 5 April 2017

On the last day of his beach vacation, Aki receives a mysterious text from Lilith. When he returns to Pieve Olimpia, he discovers that Lilith and her entire family seem to have vanished into thin air. Sick with worry for his friend, Aki rushes off to find Mr. Filippotti, who tells him that Lilith has gone to the parallel crystal called Atum, inhabited by the gods and mythological creatures of Ancient Egypt. It turns out that one of Lilith's recurring dreams had revealed a terrible threat is hanging over the ancient and powerful talisman known as the Eye of Horus. Aki decides to go after his friend. The Sphere of Time beams him to the Crystal of Atum right in the middle of a ferocious war among gods. Only after a series of dangerous and frightening adventures Aki will finally find Lilith and discover what is threatening the Eye of Horus.