I read these two books some years ago, before I was in high school. The concept really appealed to me. For fear of spoilers, I will not say much, suffice it to say reading the books gave me a different perspective on certain things, and some new ideas. The books themselves are not really complicated, don’t have the best characters around, but are a pretty solid read. When I found them online some time ago, it took me just a few hours to go through one of them.
I recommend.
And I almost forgot… The links. Have fun.