A tragedy strikes an urban dance school, when the director is pushed out of one of the windows, losing her life. Teachers and students are in shock. A former prima ballerina of the Paris Opera and her own daughter seem to have a very special and troubled relationship with the victim's husband. Inspector Cassandre and the members of her team find themselves immersed in an environment where relationships are complex and secrets are well kept. They strive to shed light on all the interpersonal ties of the establishment.
