Final film idea

The main character, Andrew Francis, is a serial killer that is obsessed and self-confessed as being addicted to killing. His wife, Maria Francis, does not suspect he's a serial killer, but notices things that shows socially detached symptoms and becomes increasingly wary.  He keeps a diary that gives great details of how he kills these people. He usually uses a gun, but also describes other ways he has killed before in subject narration through his diary. He believes he can never been caught, no record of the murders have ever come back to him, but one day after a murder his wife shoots him dead. After, it reveals in a flashback that his wife has found and read his diary and shows her disgust and distress at it, ultimately showing why she killed her husband.