Marguerite de Valois, daughter of Catherine de Médicis, celebrates her wedding with Henri de Navarre. Officially, it's a rapprochement between the League and the Huguenots. In fact, it was an opportunity to bring all the Huguenots to Paris and kill them all at once. King Charles IX fails in his attempt on Coligny's life. Queen Margot tries to save her husband from the St. Bartholomew's Day massacre by preventing the annulment of his marriage, forcing Henri to share her bed. Two knights from opposing camps are wounded and, saved în extremis, are hidden together by the queen and her cousin. Margot falls in love with one of them, but has to run to warn her husband of a new attack and cannot prevent the two knights from being beheaded.

A friendly average Frenchman pretends to be a famous commissioner on vacation. He arrives in a castle converted into a boarding house where, after dinner, guests are invited to participate in a "murder-party". The so-called victim of this little game is really murdered and the fake commissioner must lead the investigation.