The 5th Wave Series by Rick Yancey

The 5th Wave Series by Rick Yancey - After a devastating alien invasion carried out in successive “waves,” humanity is nearly wiped out. As trust becomes deadly and the enemy looks human, a small group of teenagers fights to survive, protect those they love, and uncover the truth behind the invasion—leading to a final battle for the future of humankind.

Total 3 Books in the Series -

1. The 5th Wave – After an alien invasion devastates Earth, Cassie fights to survive and save her brother.
2. The Infinite Sea – The remaining humans struggle to trust each other as the enemy blends in among them.
3. The Last Star – The final stand for humanity as the survivors face extinction or hope.