https://en.wikipedia.org/wiki/The_Skeleton_Key
>With strategic use of brick dust, Caroline flees to the attic, calls 9-1-1 and Jill for help, and casts what she believes is a protective spell. Violet, having caught up with her, reveals she actually trapped herself inside a protective circle. Violet pushes a full-length mirror at Caroline, which reflects the original owner's daughter, then Violet, and lastly Mama Cecile. A recording of the Conjure of Sacrifice plays, and the two switch bodies.
Violet (revealed to be Mama Cecile, who had been occupying Violet's body through the Conjure) wakes up in Caroline's body, and force-feeds Caroline (now in Violet's body) a potion that induces a stroke-like paralytic state like Ben's. Luke (actually Papa Justify) arrives upstairs, revealing that Mama Cecile and Papa Justify have been conducting the Conjure of Sacrifice on new people since their supposed deaths; they had swapped places with the two children just before the lynching. Because hoodoo is supposedly only effective on those who believe in it, Cecile and Justify had to wait for Caroline to come to believe in hoodoo through her own investigation.
The demons are trapped now and are in need of a new vessel.
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