The young violinist Geraldine Dvorsky is on the brink of a steep career. However, it comes to an abrupt end when she breaks her wrist in a car accident. The accident is caused by music critic Federico Stronchetti, who is soon found murdered at the foot of the Castel Sant'Angelo. The suspicion immediately falls on the young violinist. However, Commissario Caselli quickly uncovers more suspects in his investigation. And while he reveals new intrigues among the eccentric opera stars, another murder occurs. Commissario Alessandro Caselli investigates in Rome - an elegant detective with good manners and taste.