When Marjorie went to live with her frosty maiden aunt, she couldn’t imagine the adventures she would have with dragons — good and bad — and all the strange creatures that live in a mysterious land beneath the Tarn. The spunky 9-year-old redhead forges an unlikely friendship with an insecure young boy named Rufus who lives with his crusty grandfather next door. When Jorie — for that is what she prefers to be called — finds a dusty ancient book about dragons, she learns four strange words that will send the two of them into a mysterious land beneath the Tarn, riddled with enchantment and danger. Hungry for adventure, the children take the plunge, quite literally, and find themselves in the magic land of Cabrynthius.

Upon meeting the good dragon, the Great Grootmonya, Jorie and Rufus are given a quest to find the three Stones of Maalog — stones of enormous power — and return them to their rightful place in Cabrynthius. Their mission is neither easy nor safe, and is peppered with perils in the form of the evil black half-dragon who rules the shadowy side of the land. They have to deal with a wicked and greedy professor, the tragic daughter of the bad dragon, caves of fire, rocky mountainous climbs, and a deadly poisonous butterfly.

Jorie must rely on her wits and courage to win the day? Can she do this? Can she find all three Stones? Can she save Rufus when disaster befalls him? Can she emerge victorious? She and Rufus have some hair-raising challenges, in which they learn valuable lessons about loyalty, bravery, and friendship.