Astraia Holmes, sister of Sherlock, is baffled by a series of bizarre and brutal murders committed by a dragon-like assailant, and desperately wishing to impress her brother and solve the crimes she teams up with a mysterious and brilliant young woman, Madeleine Barquist. Sherlock suspects an ancient malevolence at work and he fears for Astraia's safety. The signs point to a Chinese Dragon God Cult known as the Ya Zi, a warrior society originally...