PositiveThe Historical Novel SocietyThe book opens at the heart of the Ottoman Empire. We are in a square in the ancient Imperial capital; and in this square, in the stonework of the Cannon Gate, has been carved a niche. In this niche is a severed head ... The book revolves around the inhabitants of the niche—the current, historical, and potential occupants, plus Abdullah and the Doctor, the civil servants charged with maintaining the integrity of the grisly relics, and the corrupt courier whose job it is to speed newly decapitated heads to their care.