Traumatized kid by pedofile takes revenge and lives in his attic movie

It was a guy that was traumatized by a pedophile at a young age but the pedophile was a police officer so the kid wanted to take revenge so when he was around 20 he went with a friend (girl)live in the guys house on the attic in a room they dont use it was some kind of trent in the movie to do that but the girl got spotted and idk what happend to her but the guy stayed living there and played mind games with them and disguised with a black ape mask in a scene where he killed the son of the police officer he hide under the bed and the movie ends with the police officer being exposed as pedophile and idk what happened to the boy