This is driving me crazy. I read a book about a woman who had a ton of different disguises that she used to seduce men and then murder them. It was obviously a book with mature content. It also had another point of view that belonged to a police officer that was investigating the case. Eventually they crossed paths but I can't exactly remember what happened. For some reason I remember the authors name being Ethan Klark or maybe something similar but I can't find it anywhere! The title of the book was only one word.