5th Wave is for you.
The war was over before it even started. Earth's human population was decimated in just a few short months by four strategic waves of alien attacks. Cassie is only 16, but she plans to stay alive as long as she can, and go down fighting. Rule number 1 is trust no one, no matter what they look like. There's no way to tell who's really human, and who just looks like one.
And then there's Zombie. Who he was before the First Wave is dead, and there is only Zombie now. Saved from the brink of death by what remains of the U.S. military, Zombie begins his training to hunt down and kill the alien invaders. Fueled by guilt and rage, he's ready to exact revenge at any cost.
Cassie and Zombie deal with the invasion in different ways, but they are both bound by a promise, and the desire to save what's left of the human race. Action packed, full of guns, explosions, twists, and lies within lies, it's the story of saving more than just a group of people. It's about saving the things that really matter.