A maniac escapes from a mental institution and disguises himself as a member of the faculty at St. Trinian's, a small Catholic college. He murders a young female professor, but the crime remains unsolved. Julie Parker (Francine Forbes) fills the vacant position after several other applicants refuse to accept the "jinxed" classroom. She begins dating fellow teacher Mark (Ric Randig) and tries to get through to her wild, party-loving students. One night, a young girl from her class is found dead at a drive-in theater and Julie discovers that Mark was involved with the woman who was killed the semester before. She suspects him and decides to break into his apartment and investigate. Her findings are flimsy and when another teacher is found mutilated on campus, she goes to the dean, Father Janson (Dick Biel), to discuss her resignation. Before she can escape, however, Julie will find herself face to face with the real killer and learn the horrible truth.