Di Renjie and the Flying Yaksha

In the fourth year of Yifeng in the Tang dynasty, Ming Chongyan, a remonstrance official, is stabbed to death at his residence under highly suspicious circumstances. That same day, a children's rhyme about a flying yaksha who kills people begins circulating in Luoyang. Ming Chongyan was a favorite of Empress Wu Zetian, and his death leaves her furious. She orders Di Renjie, an assistant minister of the Court of Judicial Review, to investigate the flying yaksha murders. As the investigation deepens, Di Renjie discovers that both the Crown Prince and Wu Zetian are suspects. He too is drawn, against his will, into a struggle at court...