Book 1

Connecticut middle-schooler Jake and his older sister Kady are transported by a Mayan artifact to a strange world inhabited by a mix of people from long-lost civilizations who are threatened by prehistoric creatures and an evil alchemist, the Skull King.

Book 2

An ancient and priceless ruby - the Eye of Ra - has been found beneath the Egyptian sands in the Valley of the Kings. Legend has it the jewel holds immense power, but it has fallen into the wrong hands - which means trouble for Jake and Kady Ransom, and a new action-packed adventure as the pair are catapulted into an ancient land of shifting sands, dark magic and dangerous enemies ...Can Jake and Kady survive and outwit the Skull King himself?