Return to Atlantis is the third book of the crystal trilogy. The first book is: The Atlantis Crystal. The second is: She Waits in Atlantis. In this book, all the characters in the first books become active participants in trying to solve crystal mysteries, and in trying to save themselves from known and unknown dangers. The central characters, Digger and Jeannie, try to protect the ancient golden urn at the Yucatan dig site, while at the same time try to undo the damage they caused to Therena, the Atlantean princess. Karen and Luke are drawn to the ancient Mexican dig site when they learn Jeanne has disappeared, under mysterious circumstances. The young daughter, Tammy, accompanies them to help with her sensitivity to the crystals. In their rush to help everyone, Digger and Madera are carried to places they can hardly imagine. Did they really visit Atlantis to escape from an impossible situation, or was Madera only dreaming?