This is a wonderfully creepy book. Not haunting, but the descriptions of deaths can be very gruesome. A killer, thinking that they are so much more clever than the police, mimics serial killers while taunting Lieutenant Eve Dallas. There is a bit of extra tension since Peabody is also taking her Detectives Exam and other drama in the background. Really this is a great addition to the series. If you are interested in Police Procedural Fiction and do not mind that it is set in the (not so) distant future then this is a great book for you.