Young Dalia Rossi is mistaken for a mad person and is committed to "Villa Felicità", a mental institution run by Professor Ruiz. When she is first examined she is found sane and sound. The only trouble is that the psychiatrist who examines her is ... a madman who believes he is a doctor! The real physician, as for him, is persuaded Dalia is ... insane! Things will return to normal only after a host of ups and downs, a riot by the patients and an eventful police raid.