Summary: A prima ballerina is killed just before the opening of a show, & her stand-in, Eleonora, becomes the prime suspect. Guilty or innocent, her life and career could be ruined. Against the background of a Milanese autumn, and with the notes of a Bach fugue constantly in his head, police chief Bonardi conducts the investigation. One of a series of original stories interspersed with exercises and illustrations designed to improve reading and speaking skills.