Here we have another free form night, so we're going with a TV movie classic, Satan's School for Girls, starring Kate Jackson and Cheryl Ladd two years before they became Charlie's Angels. And this is from executive producer Aaron Spelling, who had worked with Jackson on The Rookies and then, of course, Angels. Plot is thus: Pamela Franklin plays a young woman whose sister died under mysterious circumstances. She goes undercover at the school her sister attended, meeting among her new classmates Ladd and Jackson, and tries to unravel what evil hijinks are occurring there...and driving young women to death! And worse!
Yes, well, it was 1973. And a TV movie. So don't let the title get you too excited.
It is available on DVD from Amazon.