Twenty months spent as the shogun's sosakan-sama – most honorable investigator of events, situations, and people – has left Sano Ichiro weary. He looks forward to the comforts that his arranged marriage promises: a private life with a sweet, submissive wife and a month's holiday to celebrate their union. However, the death of the shogun's favorite concubine interrupts the couple's wedding ceremony and shatters any hopes the samurai detective had about enjoying a little peace with his new wife. After Sano traces the cause of Lady Harume's death to a self-inflicted tattoo, he must travel into the cloistered, forbidden world of the shogun's women to untangle the complicated web of Harume's lovers, rivals, and troubled past, and identify her killer. To make matters worse, Reiko, his beautiful young bride, reveals herself to be not a traditional, obedient wife, but instead, a headstrong, intelligent, aspiring detective bent on helping Sano with his new case. Sano is horrified at her unladylike behavior, and the resulting sparks make their budding love as exciting as the mystery surrounding Lady Harume's death. Amid the heightened tensions and political machinations of feudal Japan, Sano faces a daunting, complex investigation.