Astrid Nielsen works in the library of the judicial police. She has Asperger's syndrome. With an incredible memory, she excels at analyzing files of ongoing investigations. The district commander decides to use it to the fullest, entrusting her with very complex investigations which have remained unsolved to date.
Chateauneuf-sur-Valone, Mayor Félix de Ponte is preparing for his re-election, hoping to beat the far-right candidate Jean-Luc Molment Martinez. But when a video revealing his extra-marital affair is broadcast on the networks, Félix's life will be turned upside down. Devastated, betrayed and humiliated, his wife, Rose, decides to react and runs against him in the elections.
Shy cop Charlie, descendant of Sherlock Holmes, lives with grandfather until a car accident changes her. Her newfound energy and brilliance as a cop lets her embrace life and solve crimes with Watson-like partner Samy.
