The 5th wave is a post apocalyptical world where humans are no longer at the top of the food chain. Through the first four waves of an alien force‘s deadly attack ninety nine percent of the worlds population is gone and now Cassie has to find a way to survive. This book is told in first person but the person who‘s viewpoint it is in swaps back and forth. If I could compare this book to another book I would choose contagion by Teri Terry.