Bad Sister
As a top student at St. Adeline's Catholic Boarding School, Zoe senses that something is not quite right about the school's new nun-- a sense proven to be true when it is revealed the "good' nun is an imposter with a fatal attraction to Zoe's brother.
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Bad Sister (2015) is a thriller movie running 1h 25m. Starring Alyshia Ochse, Devon Werkheiser, Ryan Whitney. Rated 6.6/10 on TMDB. Watch it online free on ZapFlix.