A series of victims are paralyzed while having their bellies ripped open, much in the same way tarantulas are killed by the black wasp. The victims all seem to have a connection with a spa.
The husband receives a picture of his wife and her lover standing naked in front of each other and he confronts her with it. No sex scenes between the two lovers. The wife (Barbara Bouchet) shows us her naked body a few times outside of the picture. There's a sex scene between the police inspector and his own wife.