I liked this story! I enjoyed reading Cassie -- she has great attitude, humor, and perseverance. I liked the weight that a promise held for several characters of the book. This book can be read on a deeper lever, as Rick Yancey explores what is means to be human. It's not just physical, but it is in our reactions, emotions, and more. I had the opportunity to see Rick Yancey speak at the Miami Book Fair in November 2015 and he explained how he had often seen alien invasion type books and/or movies where humans in all their awesomeness can defeat the aliens and YAY! humans. And not that humans aren't awesome, but he was really into the exploring the idea -- what if the aliens are really smart and clever as well? I was definitely blown away by some of the things they orchestrated and how much thought and planning went into the waves. Rick Yancey also has some deep and beautiful, highly thought-provoking prose that will just casually come out of his character's minds as they are fighting to survive... 
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