The Uninvited ending / spoiler
Her sister Alex is really dead and she's been having hallucinations that she's been speaking with her and helping her the whole time. A series of flashbacks reveal that every conversation Anna and Alex had was imaginary, Anna killed Matt because he knew what really happened on the night of the fire: Anna arrived home to find Rachel and her father having sex. Disgusted, she went to the boathouse to fill a watering can with gasoline so she could burn down the house. She did not shut off the faucet all the way, and when Alex arrived she knocked over a lantern. The boathouse exploded, killing Alex and her mother. Anna was the one that finally stabbed Rachel to death and not Alex. Anna was arrested and institutionalized once again. It is revealed that the other mental hospital inmate, Mildred Kemp, was the nanny who killed the children, which is where Anna got the idea. The psychiatrist comes by to see Anna, and she tells him "I finished what I started," meaning to return home and kill Rachel. Standing in her room with pearls in her hand Mildred Kemp says "welcome home" to Anna who smiles back at her and the movie ends.
Submitted by Hillary K.
