Gianni Perticaroli: 5 books

Achilles Chiorri, known as Aki, believes he is a normal twelve year-old like everyone else; that is, until he discovers he has the power to travel to the distant worlds of the Parallel Crystals. With the help of a mighty artifact, the Sphere of Time, Aki goes on his first great journey and discovers...

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...

Mysterious, disturbing signals from the crystals. Devastating, inexplicable catastrophes on Earth. Are the two connected? Meanwhile, a new and dangerous adventure awaits Aki as he goes on a backward journey to Peru to free Emilio and the Master of Knowledge, Pioquinto Conocedor, from the clutches...

Following his first journey to the Crystal of Yggdrasil, Aki is shaken and confused. He still can't believe that the gods and creatures he thought existed only in mythology are actually real and living. But he will have to get used to the idea very soon, because this is just the beginning of his new...

Lilith's dreams are becoming increasingly powerful and horrifying, while the Sphere of Time has turned a frightful blood red color... It all seems to indicate that something serious and unexpected is happening on the parallel crystals. Not even the Master of Knowledge has an explanation for what is...