Diego's Dragon, Book Four: Mazes, Monsters, and Mythical Heroes

For all Diego knows, his dragon has fallen for the last time. All that remains of the Aztec nation hides in the forests and caves beyond Tenochtitlan. If Satadon can find and destroy the Mexica people, Diego, Racquel, and their families will join those who disappeared two years ago. Jenna, Racquel's conduit, gently touches symbols carved on the walls of her prison. If she can find the right sequence inside the temple, she might open an ancient door unknown even to the Dark Lord. Satadon and the ancients are returning to Tenochtitlan. The Aztec gods are choosing sides for the coming battle. Warriors from another dimension appear in the ancient Mexica lands. Sol soars through the stars on a journey to save his dragon. Misterioso, protecting his lord, becomes weaker every hour. He believes Magnifico is dead, and he will wait and die with him if that is Sol's wish.