I thought this book was very good, one of the most interesting books I have read in a long time. It talks about humanity and how if we are in a bind or unknown situation how easily it is to turn on each other. 
 One main thing to take away from this story is the crucifix soldier. I'll let you read it to find out what that means. 
 This is a great young adult book, adult book and just entertaining read. It also has one sequel out called the "Infinite Sea" and another third book to be released next year. 
 The 5th Wave is also going to be a major motion picture in Jan. 2016.