Wow. This book is a hard one to pin down.Writing-wise, Anderson certainly showcases her abilities. This is my second R.J. Anderson book, and without I doubt, I can claim that she can give any author a run for their money. Her stories always suck me in. Her books always have a hidden time warp - I sit down to read and before I know it, it is 2 hours later and I'm halfway through a book.About the story...wow. I love a good twist in a book, but I believe the main issue was that Anderson did her job too well. I was highly invested in the realistic storyline. I can ever say I was enjoying every minute of the first two-thirds of the book. I also enjoy sci-fi books as well. But I was hard to suddenly switch gears so suddenly. It was like watchingGirl, Interrupted which then turns into a Doctor Who episode. Both brilliant, but I need a little warning first. I was still so shocked that I wasn't able to enjoy the sci-fi ending of the book. Also, can ask if I was the only one that was completely turned off by Faraday? I really enjoyed him while Alison was in the mental ward, but turning him into the love interest felt very creepy and weird. It did seem like he was scamming off of a teenage chick. Anderson did such an outstanding job with him in the researcher role that it felt way off when he and Alison decided to get together. This is not to say that I did not enjoy the book. Alison was a great main character. You could really feel her internal struggles and her pain in the book. She also reacted like a real person. When she is sexually assaulted, she wavered between guilt and anger, but she did not blow it off,like other YA female leads. Alison was a smart cookie, and her honesty and faults made her real. I felt that this book could have been based off of someone's life. Her bitter attitude towards the pretty popular girl guaranteed that I would stick an extra star onto my rating. Tori, the pretty perfect girl, punched the pretty pretty princess role right in the face and sent a clear message that not all popular pretty cheerleaders are cruel and mean. They have their own stereotypes to battle as well, and when the "underdog" character apologized for the undeserved contempt, I cheered very loudly.Ultraviolet,despite the large gaping genre-changing shock, was a very endearing and worthwhile read. I'll be looking for the sequel for this beauty very soon.