 Divorcee Susan Jeremy goes to a local Los Angeles county hospital for a routine exam and through a series of circumstances finds herself stranded there while a maniac, dressed in a doctor s surgical mask and clothing, goes around killing all the staff are assoicated with her. Could it be posibly the psycho Harold whom killed a friend of Susan s on Valentine s Day 19 years earlier? If so, who is it since Susan has not seen Harold for all that time and there s no telling who he has grown up to look like.