The realms of the supernatural and science come together with spiritual warfare for everyone involved when Patrick and Gracie find the hot marble. Their older physicist brother Lewis analyzes it with the help of engineer friend Fred, and all of them stumble into the marble's nexus. It takes them to a world named Lanthra. There, they are caught in a demon-inspired plot to trade Earth's modern technology for Lanthra's ancient technology. Patrick wants to be a hero. Fred betrays his friends. Lewis switches sides. As for Gracie . . . What can a little girl do to save the universe?