Giulia, a famous opera singer, is poisoned during a dinner in her honor held in Don Matteo's rectory. The first suspicions fall on the young collaborator, tired of undergoing the whims of the woman, and on her husband, who would have betrayed her. The skein becomes even more tangled when the singer accuses herself of poisoning. The solution to the case lies instead in the woman's past, behind the curtain of her career and her success...
