Horror movie idea

Heres my pitch or an unnamed horror movie.

A man named Jake arrives at a quaint old cottage in the countryside, he is there to buy some jewellery from an old woman after purchasing them on ebay. As he enters the house he notices that there is an awful smell, similar to burning flesh but puts this thought to the back of his mind. The old woman settles him down and says she will be back in five minutes as she needs to get the jewellry.

After ten minutes of silence Jake gets up to investigate and he can not find the woman anywhere in the house. However, he is intrigued by a certain room as the smell he smelt earlier is coming strongly from there. He tries to open it but it is locked. He then searches the neighbouring room and finds a strange collection of clown masks. As he bends down to look closer, he hears a high pitch cackle behind him and turns round to see the old woman with a clown mask on and she repeatedly stabs him eventually killing him. After weeks, a friend of jakes is deeply worried by his disappearance and goes to the cottage as this is the last place he was known to go. Will Jakes body be found? will we find out what was in the locked room?

I can't think of a resolution for this idea, but i believe it is a good starting point to a movie.