When the rich man is killed (see violence & gore) the main character has hallucinations of creepy figures with black masks standing over the dead body and watching her. One of these same figures appears in her flashback showing her the graves of her mother and father.
The ending scene when the policeman finds the main character is very intense and scary as she has hallucinations of everyone in the building laughing and pointing at her and she sees the ruch man's corpse at the window pointing with his stub hand also laughing.