Baron Osvaldo Lambertenghi is forced to sell his ancestral castle, staying on as a bellboy when it's converted into a hotel. However he becomes vampirized when his mysterious uncle comes to stay.
Professor Fabius has found a way of transferring his personality to another person and he transfers his to the body of Giacinto Floria, a nice teacher in a women's college. Poor Giacinto becomes a sex maniac to the puzzlement of his girlfriend Mafalda.
