Donn, a strong and virile, good-looking man in his early 30s, meets Diana, a very beautiful woman in her mid-20s, and falls head over heels in 'lust' with her. He pursues her with one thing in mind. Sex! Diana loves the attention and reveals to Donn that sex is her favorite subject. They become involved, and it quickly becomes evident that Diana has something mentally and emotionally wrong. He is a prisoner of his desires and continues to pursue her, although he knows that her mental instability might become dangerous to him. He soon realizes that the danger is real, but it is impossible to escape from her entangled web.