Whilst King Gros Pif I amuses himself at debauched banquets, his musketeers pursue their tax-collecting duties with a malicious zeal. Goaded by the court jester (who is also the Queen’s lover), the ministers decide to put an end to this regime and have the King locked up. Hearing the news, the famous Chevalier Blanc comes to his rescue. Aided by the knight and his cousin Lucienne, the King flees to Flanders, where he devises a scheme to win him back the throne of France...

It starts with the discovery of a woman's corpse, then gradually reveals the past of this woman as well as the police investigation which follows the discovery.