So good! Love this book so much. The mystery in it was AWESOME. It was a really enjoyable and fun read. Well, at least for a mystery fan like me. XD 
 I guess because FBI is a huge part of this book, I kept on thinking about criminal minds while reading this book. (By the way, I am a huge fan of criminal minds. It's my favorite TV show!) Just the aspect that they both profiles serial killers kept me continuously thinking about the two and comparing them- the show and the book. Although one is actual FBI agent and one is teens with special profiling abilities, I found that the two have so many similar aspects, and both have awesome profilers. Love it! 
 I really, really enjoyed the characters in this book. They were amazing. And I found that because there were only five main characters (the teens with special abilities), plus two main FBI agents, it kept me from feeling overwhelmed, since I don't gave to try to remember ever characters name. And as I said before, the characters are amazing and awesome. 
 First off, we have our main girl, Cassie, she is a natural profiler. Which means that she has the "ability to look at a pattern of behavior and figure out the personality of the perpetrator, or guess how a given individual is likely to behave in the future." 
 Then we have Michael, who is a natural at reading emotion. This includes facial expressions, posture, gestures, the works. 
 And then there is Lia, who's special ability is deception. Which means "she has an uncanny knack for being able to tell when people are lying. And, she is a very good liar, too." 
 And then there is Sloane. (Just a side fact, when I saw her name, I thought about the main girl in Since You've Been Gone, since I just finished reading that book before this one. By the way, if you like contemporary novels that's a great book to read). Anyways, back to Sloane from The Naturals. She is a natural with numbers and probabilities. As Lia said, "she is absolutely dangerous with anything numerical. Sometimes literally." Especially after drinking caffeine. 
 "Sixteen percent of the American men have blue eyes," she informed me blithely, "But over forty percent of male TV doctors do." 
 "Roughly one percent of the population are considered to be psychopaths," Sloane announced. "Recent estimates suggest that over fourteen percent of reality television stars are." 
 Last but not least, there is Dean. Just like our main girl Cassie, he is also a natural profiler, but on a higher level. Why? You will need to read and find out! After all, what fun is there if I tell you all about the "mysterious" guy of the book? 
 I also learned a lot of profiling knowledge from this book. For example, what exactly is the job of a profiler. 
 "You don't get to meet the suspect before you profile the crime. You go to the scene and you rebuilt what happened. You take the physical evidence, you turn it into behavior, and then you try to narrow down the range of suspects. You don't know if you're looking for a man or a woman, a teenager or an old man. You know how they killed, but you don't know why. You know how they left the body, but you have to figure out how they found the victim." 
 I also learned the official definition of MO, and some other profiling words definition. 
 "MO stands for modus operandi," he said, and that's as far as he got before he shifted his gaze from my face to a spot just over my left shoulder. "Mode of operation. It refers to the method used by the killer. Location, weapon, how they pick victims, how they subdue them-that's a killer's MO." 
 Overall, I highly recommend this book to all mystery lovers. It is amazing. I really, really liked it. Or if you have read The Summoning and liked it, I also highly recommend this book to you. They have a lot of similar aspects. For example, the main character both live in a group home where there are 2 guys and 3 girls (at least for the main characters). They both are trying to figure themselves out. And they both goes on adventures and solving mysteries. That's why I believe that if you like The Summoning, you will like this book too. But overall, I recommend every mystery lovers to read this book. It is spectacular! 
 "Officially," Agent Locke said, "we use the term Unknown Subject-or UNSUB." 
 "And unofficially?" I asked. 
 Dean shoved his hands into the pockets of his jeans. "If you want to climb inside someone's head," he said roughly, "you use the word I."