Simona, an aerobic dance teacher, married to Marco an aero-nautical engineer who is so in love with his job that he neglects his young wife. Simona, dissatisfied, begins feeling a fascination for the morbid situations that comes across her path by chance and in which she allows herself to become involved. She begins to assume a double personality. She provokes her husband by accepting the amorous advances of a friend of his: when Marco discovers what is going on he and Simona leave one another. Simona is now free to follow up all the same thing happens to Marco. They try to begin all over again, but in vain. One evening while coming home from work Simona is attacked by an unknown man. But is he really a strangler…?