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Jake Ransom and the Skull King's Shadow
James Rollins
While researching Mayan artifacts, Jake's parents simply disappear. Jake, an eighth grader, and his sister Kady are invited to the British Museum to view the artifacts. Jake discovers a slot in a small gold pyramid at the museum and, with the help of a Mayan coin, he and Kady are transported into a strange new place.

This world, known as Calypsos, is inhabited with Mayans, Romans, Egyptians, Vikings, and Neanderthals, and Jake and Kady try to fit in and make friends. Dinosaurs also live in Calypsos, but
what are those other strange, mythical creatures? Does the tale told by the last Oracle have anything to do with them?

They need to find out soon because an evil force, the Skull King, is trying to get past the protection around this odd community to get at the secrets hidden within.

Did this evil king cause their parent's disappearance? Will they be able to find their parents—and their way home?