This book was, before anything, really fast-paced and entertaining. You just keep flowing through the pages and feel the action described. 
 I have a problem with the first person narrator books. But here it fits perfectly, abd really makes the read enjoyable. 
 This story is about aliens and how they manage to kill almost everybody. We have two charaters, Cassie and Ben, which fight for their own survival. 
 Cassie is a lone ranger until Evan finds her and tries to kill her, then he takes care of her. As you may think, he is an actual alien. 
 Ben is brought in a safe-house, Wright-Patterson, a military base. And, as predictable, he is trained to kill by aliens. 
 This book is predictable, more than anything. Sometimes you just have the urge to shout to them that THOSE ARE FUCKING ALIENS, STOP GOING THERE AND KILL THEM. 
 But do they listen? Or do they even think well? Not really, takes them really long time to realize. 
 Another think which didn't really bother be were the fighting scenes. Because they really seemed like Counter Strike met up with Call of Duty and Battlefiled. This is what you shall expect. 
 Overall, it is a good read, if you are a fan of survival-type books, I totally recommend them for you. Unfortunately, you get some angst, because come on, it's YA, you should see it coming , but you can handle it.