In the Tang Dynasty, Princess Taiping had a dream of riding a "silver snow-white horse" galloping under the moon in a "dream of a fairyland." The female Taoist Xuanji interpreted the dream, explaining that the white horse represents a "celestial horse," and she made the princess's "dreams come true." Xuanji gained favor. At this time, the great Tang Detective Dee solved a "massacre case," only to discover that it was a tragic event caused by the "celestial horse."