Aliens usually aren't my thing but I really liked this book. It started off strong and didn't waver. I wasn't sure I was going to like the changing points of view but as I got further into the book I started to look forward to it. The characters were well developed and the world building was thorough. Cassie and Ben were both likable characters. I loved the fight in Cassie and I absolutely loved the transformation of Ben. Ben started as a high school jock, then was a broken boy, then a built into a mindless soldier until he finally became a free thinking brave young man. What I liked best about both Cassie and Ben was that both of them still had their humanity throughout the book and that a promise is what kept both of them going. I liked Evan's character too but I wanted to know more. I also wanted to know more about what the Others actually wanted from Earth. Why are they there? Why do they need to get rid of humanity? There wasn't a clear explanation. I didn't like that so little was revealed about their true intentions. I hope that's explained in the next one. 
 This book was packed with action and momentum. I couldn't stop reading once I started. I can't wait to see what the next one brings.