A cop investigates whether the man convicted of murdering his daughter is really guilty.

Jean-Francois Abgrall, today the head of a private detective agency, was just a simple provincial gendarme back in 1989 when he was assigned to investigate a murder on a beach. Instead, his investigation put him on the trial of one of France's most terrifying serial killers, Francis Heaulme, who for eight years wandered the country committing some of the most brutal murders in the annals of modern crime. This is the true story of that manhunt, a tale of terror, suspense and determination.

The beautiful Parisian courtesan Marguerite Gauthier (Cristiana Réali), who is called a "Lady of The Camellia" because of the preference for these flowers, has many devotees among Parisian aristocrats. He really loves one - young Armand Duval (Michaël Cohen). Under the influence of the beloved father's pleas, and despite himself, he declares to Armand that he no longer loves him. She is suffering from tuberculosis, but if possible, she is in company, and renews contacts with rich devotees. Armand tries to forget about her. One evening, at a party, their paths cross again.