Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
When Callie and the other children stumble upon an ancient artifact, they find themselves facing a terrible danger from the long-ago past. Time overlaps in a mysterious way, while the children fight to help an ancient tribe in both the past and in the present.