It's hard to explain what I'm looking for but the best I can describe is "the best books they don't want you to know about."
I'm curious in finding books that are relatively obscure yet so profound and mind altering. I'd like to try and find some books that come close to the Necronomicon or some book L Ron Hubbard supposedly wrote which are suppose to drive the readers to the point of insanity because they have such an impact.
I say obscure because I'm pretty familiar with the list of books that change people's life - The Bible, The Book of Mormon, Atlas Shrugged are a few that come to mind. I'm more looking for a list of books that have the same effect but you never see on any sort of list like that. While not the best example, for me personally, Victor Frankl's Man's Search for Meaning
had a profound impact and I only found out about the book from a co-worker. Another case I found while looking in books about life changing books is this book
which apparently had a tremendous influence on some guy's life.
So, what are the most personally influential books, the books that change lives, that are relatively unknown?