What Question would you ask the Author?

This book is definitely on "my favorite books" bookshelf. It is one of those story's with a very twisted plots that reveal slowly and clearly by the end. I asked myself many questions in the first half but most of them were answered, all but one. And if Jon Krakauer by any chance reads this post please answer, What was on your mind that inspired you to write this? There are many others that write about some depressing or scary things but this isn't neither one of those. I am torturing my mind trying to imagine myself in any possible life situation after which I would go and decide to write a boo like this.