So i'm not gonna actually talk about the stories in the book but rather, the story at the end of the book, it tells the story of what I believe is the mimic and how he came about, turns out that as the Reno crew for the FNAF 6 location were deconstructing the previous animatronics, one of them (gil) found a new model and because he had experience coding, he decided to tell it to "Rip the limbs and heads off of the endoskeletons, and it worked. A little too well. the mimic moved on from endoskeletons to humans, and the last surviving Reno crew member (Danny) told the concrete crew to seal the door...
GOD THIS BOOK IS AMAZING