When private investigator Catherine Sayler is called in by the Systech corporation to find out who's sending lewd messages through the company's E-mail, the case seems merely routine. The situation changes for the worse when female employees start receiving photographs of women being tortured. But those incidents seem like childish pranks compared to Catherine's next discovery: a brutal murder. When the perverted killer begins to stalk Catherine with his twisted games, she finds it will take all her strength and intelligence to meet the inevitable confrontation. And only one of them will survive....