"I don't like it, Arthur. Something's wrong here." The search for a stolen book plunges Arthur and Marya into another magical adventure as they are drawn into the web of the ghost of an Aztec witch with terrifying powers who has for centuries been protecting something deep underground. With the help of a skeptical Texas Ranger, the teenagers must unravel clues locked away in the towers of a creepy old mansion and uncover secrets shrouded...