Nicolas de La Reynie, appointed by Louis XIV as the first police chief of Paris, pursues criminals through the labyrinthine neighborhoods of the city, unearths a tightly knit cabal of poisoners, witches, and renegade priests, and discovers that the distance between the quiet backstabbing world of the king's court and the criminal underground is disturbingly short. As he continues his investigations, La Reynie suspects that Louis's mistresses are involved in many of the nefarious plots he has uncovered, and he must decide just how far he will go to protect his king. Tucker has crafted a gripping true-crime tale of deception and murder based on thousands of pages of court transcripts and La Reynie's notebooks, letters, and diaries.