The Plumber

Imagine living at home until you are 52 years old. Your mother passes away and something snaps inside your head. You can't remember things you did the day before. You know there is something wrong and you seek help. Then everything in your mind starts getting darker and darker until you are no longer you. Something deep and dark has taken over and there is nothing you can do about it. This new personality is something born and raised in hell and is now unleashed in your body?