Storyline For My Horror Film

I have decided to write a rough outline of the storyline for my whole film, as different moments from across the narrative are likely to appear in my marketing campaign. Knowing what happens in my narrative will help me choose a title, as I have noticed that many names of horror films make a direct reference to some aspect of the plot.

I already have some ideas for my title based on the research I've done looking at existing horror movie titles, but as well as including some of the conventions/patterns I have found I also want my title to reflect my film's plot. 

My narrative begins with a group of teenagers discussing how they want to visit an abandoned, supposedly haunted house or a disused mental asylum. They tell stories about a legendary old woman who kills teenagers every seven years as revenge for a terrible event that has happened in the past. They all go to the house at 3 a.m. with a Ouija boards, and after an unsuccessful summoning of any spirits the ‘Jock’ character goes off alone to explore. Soon the group realise that he has been away for a long while, and they eventually find his body hanging from the ceiling. Soon the group splits up only to be killed off one by one. The final girl is left to fight the murderer/monster. She is an old, haggard woman covered in blood. The final girl manages to exercise the ghost from the house by killing the woman.