If you like books about aliens then this will definitely grab your interest in Rick Yancey's The 5th Wave! This book is about Cassie's struggle to survive this alien invasion on Earth, Ben's way to keep himself alive in Squad 53 and to learn how to move on, Sammy's desperateness to have his sister, Cassie, come find him, and Evan's choice between what he is and what is right. It only took a few months for the aliens to destroy over half the population. Now the question is who do you kill and who can you trust? Cassie has to consider her options everyday. She uses her instincts and her mind 24/7. Her main goal? Find Sammy and with the help of Evan she can. Now I've already read this book, but I love it so much that I am reading it again. I don't want to say any more about it because I honestly hate spoilers. All I can say is check it out and read it because it gives you a different concept on aliens and it just an amazing read. I promise it will be worth the time.