INDIVIDUAL IDEA

My idea for a horror movie would be based on the idea of a psychological horror film. I would hope that the film would mess with the viewers head. The basic premise would be a possession, but from the point of the view of the people around the victim being possessed. So you start to see subtle changes in the protagonist being possessed until the peak of the film in which the perspective changes and you go from the point of the victim. As the peak progresses you find out that what has possessed them is a spirit looking to seek revenge on the people who attacked his parents in a past life, but the only way is to take over a living body. The film would end with a massive house fire in which the possess-er and the posses-ee are killed alongside the people this 'spirit' wants to kill. It would end with a wide shot of all the dead people together  with the fire in the background.