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 This book was so much better than I thought it would be. I expected a 3-star book, and it surprised the shit out of me when I started. From the very first page, I was hooked. I'm not a huge fan of paranormal, but this is different in a way. The writing style is so, so beautiful. I just wanted to quote it on Twitter all the time. 
 The echoes are always different, depending on who's killed. It can be a sound, a smell, a sight, a taste. It also leaves the same imprint on the murderer, and that is how Violet is trying to find the killer. 
 Violet was a great main character. She wasn't whiny or annoying, but actually realistic for a change. Her friends annoyed me a bit though. They were stereotypical and didn't feel real to me, and I don't remember them very clearly, which probably means that they didn't impress me as much. 
 Jay has been Violet's best friend for years, but lately he seems different. He has changed in a good way, and Violet is not the only one who's noticed. She has her hands full, not only struggling to find the person who has been abducting and killing all these girls, but also trying to keep Jay from the popular Lissie Adams, who has been annoyingly interested in him. 
 I loved Violet and Jay's relationship, too. Their chemistry was so strong and genuine. 
 The book switched perspectives between Violet and the killer, and that was something that I absolutely loved about this book. It was refreshing. In most books, you don't see the bad guy's perspective, but it has always interested me because I want to know why they do what they do. It doesn't switch perspectives every chapter, but every now and then, when the murderer is doing something important like picking out a girl, you see his side of the story. It makes the book so much creepier, because you see how much of a sadistic psychopath he is, if you weren't convinced before. 
 The ending--oh, the ending. It was suspenseful and unpredictable (to me, at least. But I suck at knowing what's going to happen next). I can't wait to read the rest of the series, and Kimberly Derting's other book The Pledge. Oh, and I can't believe this is her debut novel. I just can't. It's so good. 
 While and even after reading this, I was seriously scared to go outside alone when it was dark. But it also made me aware of all the creeps walking around, which is a good thing, I think.