In response to a global rise in demonic possessions, the Catholic Church reopens exorcism schools to train priests in the Rite of Exorcism. On this spiritual battlefield, an unlikely warrior rises: a young nun, Sister Ann. Thrust onto the spiritual frontline with fellow student Father Dante, Sister Ann finds herself in a battle for the soul of a young girl and soon realizes the Devil has her right where he wants her.

Rumors of demonic possession at a religious convent prompts a church investigation into the strange goings-on among its nuns. A disaffected priest and his neophyte are confronted with temptation, bloodshed and a crisis of faith.

A dramatised historical account of the rise and fall of Urbain Grandier, a 17th-century Roman Catholic priest accused of witchcraft following alleged demonic possessions of sexually repressed nuns.