Chicago Police Detectives Pete Shannon and Marilyn Benson are thrust into the limelight when their first major investigation turns the city upside down. A madman is on the loose, attacking women who labor as office cleaners in downtown Chicago. As the number of attacks continues to mount, Pete and Marilyn find themselves pressured by their boss to end this reign of terror committed and to arrest this psychopathic rapist. It doesn't take long before the community becomes outraged and mounts a protest at City Hall, causing the Mayor to demand action by his police department. Meanwhile, Marilyn is forced to make a decision between a loved one who falls critically ill, and her assignment to catch this enigmatic demon.