Poorly educated by her father, a wacky researcher, Claudine is a teenager full of life who loves her small village school run by Miss Sergeant. A new teacher, Aimée Lanthenay, arrives at the school. Seemingly awkward, she is actually an arrivist who manages to get the departure of Miss Sergeant.

Sylvie, a young woman who believes to be cursed, lives in the town of Carcassonne with her guardian, Mr. Toulzac. He is a retired teacher who wishes to discover the secret of the Cathars, a Christian sect of the Middle Ages that glorified death over life. Sylvie meets Roland, a composer who instills new hope into her troubled mind. Mr. Toulzac then asks her then to renounce the world and go down a secret tomb he has just found.

Jules Vachon, a pharmacist, has two sons, Gabriel, a steady-minded young man dedicated to his job in the pharmacy, and Gaston, a good for nothing whose only talent is to seduce rich women and take money from their pockets. But it is Gaston who is hailed as a great man when he returns to his native village thanks to his deep pockets.

Elfy, Countess of Saint-Hélié's daughter, was brought up with her foster sister Anne, in an old dilapidated castle whose landlord, Baron Julius Carol, disappeared mysteriously some day. The two girls had a playmate, Hervé, the son of the gamekeeper. Now that they are adult, Anne is in love with Hervé while Elfy thinks she loves the young man. One day, the baron's mummified body is found in an oubliette and the secret of the estate is revealed...