I Am Number Four (Lorien Legacies, 1) by Pittacus Lore

Nine of us came here. We look like you. We talk like you. We live among you—but We are not you. We have powers you dream of having. We are the superheroes you worship in movies and comic books— But we are real. They caught Number One in Malaysia. Number Two in England. And Number Three in Kenya. They killed them all. I am Number Four. I am next.