This book seemed more adult than the last two. Not because of sexually explicitness but because the serial killer is so creepy and our view into his mind is more fleshed out. It's appropriately disturbing and creepy and not typical material in YA books. As a serial killer book whose prime audience is young adults, this book is darker than most YA, though if you are comparing it to regular, aimed-at-adults serial killer books this book is mild. The serial killer's psyche and his modus operandi are pretty typical and there is no graphically violent scene of blood spraying or the like. I kept expecting there to be a sex crime and thankfully there wasn't, but the reader will be sufficiently freaked out. I think I felt the book was more disturbing mostly because I didn't expect quite a realistic serial killer in a YA book. 
 The main character of the book, Violet, is now 17 and still in high school though she also works with a secret group of "psychics" who all have some special talent that enables them to help solve murders or have premonitions of murders about to take place. Violet is much younger than the other members of the team. I think Violet should have been made to be a recent high school graduate to be more plausible. I felt every scene that went back to typical high school life took me out of the story. 
 There is a romantic relationship that was ever so sweet in the first two books, but now Violet barely has time for her boyfriend, Jay, and there is another leg being built into a love triange. Jay is one of the sweetest boyfriends in YA books, but all he does in this book is complain about how he isn't able to protect Violet from bad people. It's a shame that is his only role in the book. I understand that most books for some reason have a triangle but it's so unnecessary here. Let a true life-long love alone and let it be beautiful, despite how tempting Rafe may be.