At St. Adeline's Catholic School, a charismatic but unhinged nun, Sister Sophia, develops an unhealthy obsession with one of her students, Jason. As she becomes increasingly fixated on him, her behavior becomes more erratic and her true intentions are revealed, putting Jason and his sister Zoe in grave danger. Will anyone believe Zoe's suspicions before it's too late?

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Some movies that have similar genres and were produced around the same time as Bad Sister include Escape from Pretoria, Patient Killer, A Mother on the Edge, Limehouse Golem, The, A Most Wanted Man, Every Time I Die.