The body of a woman, Célia Moreau, is found in the swimming pool of a luxury hotel in Saint-Paul-de-Vence, run by a notable of the city. The gendarmerie is ready to conclude that it was an accidental death: after a drunken evening, the victim fell into the swimming pool. When she arrived on the scene, Captain Marie Jourdan of the Lyon police quickly demonstrated that it was a murder. The gendarmerie is obliged to collaborate with Marie Jourdan, who suffers from dwarfism and has a strong character.