Les Mystères de la Chorale plot
Caroline Dubreuilh has to solve her first murder: 18-year-old Sabrya was killed when she went home after a lesson at the choir of which she was part. At the scene of the crime, Caroline meets the elderly detective Louis Kléber, with whom she will have to work. Kléber was transferred to the same commissariat as Caroline at his own request, because he wanted to spend more time with his daughter Hélène, who is a pianist in the choir where the victim sang. It soon becomes apparent that many choir members are trying to hide all sorts of things.