Shaman by name and shaman by nature. Billy just hasn't found his magic yet - but he is learning fast. No one is more surprised than Billy when he wakes up on a Chinese battlefield. Scooped from the jaws of death by a boy called Han, Billy's far from rescued. Taking refuge in the royal stables, the boys are soon held hostage by the Emperor Wu. He's at war with the Horse King whose powerful and magical herd of horses, the heavenly horses of Ferghana, he wants for his own. It takes all Billy's skills and a very special spirit horse to get Han to safety and Billy back to his friend Charles Darwin, a two-hundred-year-old talking tortoise. Join Billy, a new kind of explorer who sets out to return artefacts to their original home.