Usually, I don't care very much for YA novels. Unless it is written by an author like Dan Wells. Here we've got an interesting plot with many different layers, situated in a classic post apocalyptic world: a strong, clever heroine will quite literally try to save all mankind. Expect well documented science fiction, including virology, politics, action, and many twists. The author wrote this book with his daughters in mind, and it shows. It opens numerous possibilities of reflection about human condition, ethics, mass manipulation, war crimes, and more basically, friendship, family and relationships. 
 At last a book I can recommend to my own daughter ;)