In the carefully ordered world of seventeenth-century Japan, the Yoshiwara pleasure quarter is a place where men of all classes can drink, revel, and enjoy the favors of beautiful courtesans. But on a cold winter's dawn, Sano Ichiro--the shogun's Most Honorable Investigator of Events, Situations, and People--must visit Yoshiwara on a most unpleasant mission. Within a house of assignation reserved for the wealthiest, most prominent men, a terrible murder has occurred. In a room that reeks of liquor and sex, the shogun's cousin and heir, Lord Mitsuyoshi, lies dead, a flowered hairpin embedded in his eye, in the bed of the famous courtesan, Lady Wisteria.