Satan's School for Girls (1973)

Cast:
Pamela Franklin .... Elizabeth Sayers - Kate Jackson .... Roberta Lockhart - Lloyd Bochner .... Delacroix - Jamie Smith Jackson .... Debbie - Roy Thinnes .... Clampett - Jo Van Fleet .... Headmistress - Cheryl Stoppelmoor .... Jody - Directed by David Lowell Rich - Produced by A. Spelling & L. Goldberg - Written by A. A. Ross - Runtime: 1 hour, 15 minutes

One of the most memorable made-for-TV horror films of the 1970s, Satan's School for Girls is set an exclusive institution of learning in Salem, MA, where students have been committing suicide at an alarming rate.

A young woman named Elizabeth Sayres (Pamela Franklin) enrolls at the all-girl's school under an assumed name, hoping to find out why her sister felt compelled to kill herself and begins to explore the extracurricular activities that secretly exist.

She becomes friend with another student Roberta Lockhart (Kate Jackson) and together they try to find the obscure truth. For a number of girls, studying demonic teaching rather than their textbooks is unfortunately what makes an "A" student.

The two young woman end up walking the same dark hallways that Elizabeth's sister walked before she met unmentionable fate. Slowly and deliberately, Elizabeth is drawn into a coven of Satan worshipers -- and soon she realizes that she herself has demonic potential.

From: http://www.kate-jackson.com/satans_school_for_girls.htm