Books in the Heirs of the Medallion series

On the Summer Solstice, through the hole in the medallion Juan and Sophia see an ancient stone mason at work, but when they get to Great Grandfather he has no explanation of what it means. Now the twins begin to learn about Great Grandfather's past, an astonishing story which neither of them had any clue about.

The mysterious medallion is passed on to Lita, grand daughter of Cuto. She and her brother Rutu set out to find the great waters described by traders from the northwest. The journey is interrupted by starvation conditions in the winter and an encounter with The Beast.