The first 60-70 pages get boring, I get that there is the big psychological thriller in the second half of the book and it's a little Blair Witch but it was just a tough read. Maybe the movie/audio book would be boring. The first part made me want to either skip ahead or end things, the reader shouldn't feel that way.

Someone with multiple personalities could be a lot a fun at least in the first half. I recently read Raise High the Roof beam, Carpenter about 5 people stuck in a car. Salinger was able to jump around and make it more interesting.