I'm loving this series so far! Non-spoilery review on BookNerdsAcrossAmerica.com: http://www.booknerdsacrossamerica.com.... But I have questions (below)!!!! 
 (view spoiler)[ 
 There's more to Blackthorn, isn't there?! We get hints through their clothes and their dorm that they aren't a normal school, but we never get to their story before the end of the book. Also, the teachers caused the second Code Black as part of the final, right?! Where were the other grades at this time? And who/what caused the first Code Black? 
 I hope we get answers to these questions in the next books! *waits patiently* 
 (hide spoiler)]