New idea for a horror movie

My idea for a new horror film is going to involve an abandoned house that is situated on a normal suburbian road and this is because its the symbol of innocence. It would be a story of 7 days which could be down to the influence of 'The Ring'. It would be based around a couple living alone without worry of anything, it would be very normal with them having normal jobs in a normal world, until the women is told something that would change their lives for ever. It would be that the previous residents of the building had died due to a horrific attack, the way in which she finds out is that it is on the news at the time. From that moment on her life is turned upside down, everywhere she looks she see's the previous owners and young son. She is haunted by them for the rest of her life and can't carry on because of this. The husband is as good as unaware of the entire thing. He can't see the previous owners and nor can he understand what his wife is going through. This pushes their relationship to near breaking point and eventually the women is unable to control what she does and becomes possesed by the previous spirits of the home. The film would end with a car crash although there was no driver in the car, the spirits have gone and everything is restored to the norm. You do see the lights flicker towards the end of the film, suggesting something still lives on