My thoughts:

At the beginning - I love me a Ghostbuster tries to debunk the haunted house story with lots of cliches.

1/3 the way through - That is the wrong use of the word Szchiophrenic - I am really not liking this story.

2/3 of the way through - I know exactly where this is going - I love this particular twist when done well.

85% through - the protagonist is only beginning to suspect the twist ? He should read more ghost stories and see more movies.- wait this was written in the 1980's - some of them hadn't happened yet? Maybe some Shirley Jackson would have helped though.

100% Well Mr - How come it took you soooo long to see all of this?

Now? - Must read the next in the series.