Nicolas investigates the mysterious death of Viscount Lionel de Ruissec.

Commissioner Lardin has apparently been murdered, and letters comprising the King have been stolen.

Beautiful Elodie Galaine is strangled to death at a party; investigation leads toward the family.

Nicolas Le Floch is suspected of a crime; Louis XV sends him to London.

Nicolas Le Floch investigates the theft of a priceless pearl, The Tear of Warsaw.

Le Floch falls into a terrible trap while investigating the beheading of Count Louis Charles Allas.