In 1477 Charles the Bolds dies, his only child is a girl which cannot rule wo a husband. Meanwhile in Austria, Emperor Frederick III and his antagonist Louis XI France battle over said marriage prospects, battles ensue, tragedy falls.
Astrid and Raphaëlle are back for a new round of investigations that will see them team up with the secret services, pursue a professional killer, rub shoulders with Mormons, the horse racing world, the last descendant of an Aztec tribe, a Buddhist temple, a film set and even confront a criminal who dangerously transforms under the full moon...