Let's Pretend You're Dead

This story would fall under the category of pyschological horror. A young actress is invited to study privately with her idol, an older actress who mysteriously fell out of the public eye. Well, the older actress turns out to be a homicidal maniac and imprisons the younger actress in the home. What follows is a tense, exciting adventure as the younger actress fights to win her freedom and save her life.Since it was some time ago that I read the book and it is in storage, I can give you no names. And I don't recall the motivation of the older actress.