The successful businessman Pierre Baldini is found murdered. He had just disinherit his daughter Jade to bequeath his entire fortune to some friends. Annie is troubled as Jade seems to be the main suspect and could possibly be her lost daughter...

In 1972, Annie Gréco, the first woman appointed police commissioner in France, took up her duties in general disbelief at the Lille police station. As soon as she arrives, she must go to a crime scene. Actor Richard Planck was indeed found dead in his trailer, on the set of his new feature film. The main suspect is none other than the young star of the film, Anna Delange, who had a stormy romantic relationship with Richard. Gréco recruits the worst hothead of the police station, Inspector Max Beretta, as his deputy. To cure his problems of violence, the superintendent obliges him to undergo therapy with a young psychologist who is a little crazy, Rose Bellecour...