The Cloud of Unknowing Book

It's not that this book was bad, exactly, but I just didn't think that it accomplished what it was trying to do. Another book delving into perception versus reality, this time with latent paranoid schizophrenia thrown in, all with the intent (so I felt) of drawing the reader into the cloud of unknowing as if they were experienceing it rather than just reading about it. I don't know if it was the format or the length, but it just didn't happen for me. Instead, I felt like we just had the classic case of an unreliable narrator who is somewhere between announcing and trying to hide that fact. By the time I got to the twist at this end, I thought "so this is it?" Not that I had been expecting the twist all along, but that I hadn't expected this book to need one if it had in fact created for me feelings of doubt and unreality instead of just describing them for me in unsatisfying snippets and quotes. I probably would have liked it better had it been straight up detective novel; a little more The Usual Suspects and a little less Fight Club.