Dressed For Slaughter

A book cannon to the One day at Freddy's book series, which was created by endergirl1421_YT

A man named William Afton has struggled with different mental issues throughout his whole life. When he moved from England down to Hurricane Utah during his highschool years, he met a long lasting friend, Vincent Miller. Together the two will create a very successful businesses: Fazbear entertainment. But everything will go down hill, soon William will murder some kids, and will try to kill Vincent and his kids as well. What will happen to him in the end?
Find out by reading Dressed for Slaughter.

Also you should definitely read the One day at Freddy'sFreddy's books to help better understand this...