An actor is filmed on stage in front of a pasteboard decor and "sings" the famous aria of the Duke of Mantoue in Rigoletto by Giuseppe Verdi. In reality we hear La donna è mobile recorded on record a few years before by the tenor Enrico Caruso, one of the greatest opera singers. The illusion is perfect! In this film German inventor and producer Alfred Duskes used the synchronisation process Cinophon that he himself developed.