the twisted ones is a book written by Scott caution, the creator of five nights at Freddys which the book is set on, and the creator of many other books including the prequel which is silver eyes (I never got to read the silver eyes that much)
the book is taken place after the silver eyes, Charlie is now a collage student studying robotics while trying to forget about the events at the Freddy Fazbears pizzeria and her father who killed himself after being accused of the murders, which were actually the doing of William Afton who was working in the pizzeria by the name Dave Miller before being caught as the man behind the slaughter who lured the five children and stuffed them in animatronic suits, before dying himself due to the springlock mechanism in his own suit. As Charlie studies in collage she begins seeing weird dreams, additionally the myths and disappearances in her area may also be related to the animatronics, which she tries to forget but due to her studying robotics. despite trying to forget a part of her is also curious about what happened during the incident. (in the silver eyes she was just a kid and not a collage student).