Sharp White Plot

As a group we have decided that our film will be along the lines as the film 'The strangers' but with one victim,not two. By having only one victim, it makes it more our own as it will not be exactly the same as the strangers.  
The plot for our film is; A young girl returns home from college, carrying her work. She's struggling with the front door keys, when she finally opens the door she remembers that she has left something behind. She then makes her way back to the car, leaving the front door open, un-knowing that there is a visitor making its way into her home. When she then re-enters her home, she locks the door behind her, un-aware that she is not alone. The masked stranger, then makes its way to the back door and welcomes in two accomplishes. The victim can feel the presence, but doesn't see them.

You will never know who they are, or why they are there. Maybe they got bored?or maybe its revenge, we will never know the true story behind the un wanted visit.