The erotic drama Bella di Giorno follows a woman who haunted by her desires decides with the help and encouragement of her friend to get a separate life without her husband's knowledge. Wealthy middle-class wife by day, she becomes Bella by night and join her neighborhood's brothel where she can devotes herself to her voracious fantasies. Her huge appetite for sex makes a name for the new lady of the night, exposing her to being recognized as the elegant wife of a businessman.
Andrea, a quiet engineer, one night takes a drive to try to relax his insomnia. When he arrived near the airport, a beautiful stranger, Diana, fell in terror on the hood, chased by some killers. Thus began the flight of the two; the girl smuggled some wonderful emeralds and has no intention of giving up her booty so Andrea finds himself an accomplice unaware of her escape. Having entrusted the emeralds to a friend, the two go from one ambush to another until the moment they meet Jack, Diana's mature and rich ex-lover afflicted by immobility and moreover with an unbearable wife. There is no time not only to rest but not even to think about insomnia and the good Andrea, already very attracted to the unknown woman, does everything to help her. After negotiations concluded satisfactorily for the ingenious Diana. The two, who now love each other, decide to cut the rope forever.
