'The Shack'

I'm reading The Shack, the best-selling novel by William P. Young. I've gotten about one-third of the way through. There have been times in these opening pages when Young's writing has been tediously descriptive.
But I've just finished the fifth chapter, the last pages of which found me chilling, something I initially thought was only my imagination, until I looked to see the hairs on my arms standing on end. (Those of you who have read it already likely know exactly where I mean.)
I was going to go to bed soon, but now I need to learn more about what happens to Mack Phillips, Young's protagonist, in the shack.
My recommendation so far? Read this book.