Hercules decides to avenge the death of his wife, murdered at the hands of Éurito, king of Ecalia, but everything is a plot of an ambitious courtier. Hercules ends up falling in love with Deyanira, who is now a good queen.

The movie is about a student in Turin during the 1920s (moved up from the earlier versions) and his love for a a seamstress. The student, Mario, is played by Walter Slezak; the girl Dorina by Carmen Boni. The femme fatale Elena (Elena Sangro) threatens the relationship. When school days end, seen here as a kind of transitory idyll, it is "farewell to youth" as the title states, and a melancholy goodbye to youthful romances as well to allow new lives to take form.

The famous composer's life and his career. His love story with Isabella Colbran, the soprano who was to become his wife and the singer in all his operas up to the unfortunate day she lost her voice.