A patient at a private clinic for sufferers of sexual dysfunction begins a tentative affair with one of the other patients while a killer stalks the institution.

A young woman goes to teach at the Ravenscroft Institute, a spooky old girls' school overrun by ants and staffed by some unusual types. Spurred on by a series of horrific hallucinations, she begins to investigate the mysterious disappearances of several students.

July '72. Vietnam. Lt. Steve Shepard missing in action. Presumed dead...15 years later he's still there.