"One of the least understood and often maligned aspects of the Tokugawa Shogunate is the Ooku, or 'Great Interior, ' the institution within the shogun's palace, administered by and for the upper-class shogunal women and their attendants who resided there. Long the object of titillation and a favorite subject for off-the-wall fantasy in historical TV and film dramas, the actual daily life, practices, cultural roles, and ultimate missions of these women have remained largely in the dark, except for occasional explosions of scandal. In crystal-clear prose that is a pleasure to read, this new...