The book Playmates was made into the movie The Maddening.
Book details for Playmates
Andrew Neiderman also wrote The Devil's Advocate (1990).
Movie details for The Maddening
Actors on this movie include Burt Reynolds, Angie Dickinson, Mia Sara, Brian Wimmer, Josh Mostel, William Hickey, Kayla Buglewicz, Candace Hutson, Angela Bomford, Darrell Fetty, Rett Wedding, Bobby Amor, Marie Debrey, Victoria Bass, Daniel Greene, Greg Kasper and Walter Bithell.