When They Came (Book 1) by Kody Boye

I was never afraid of monsters—at least, not until They came: the visitors from outer space.

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Six years later, at the age of seventeen, I'm just about to graduate from school and declare my career of choice. The Midnight Guard—who protect our community from the vicious things that lie outside our walls—calls to me, and a shortage of applicants instantly lands me a spot in their ranks.

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But when I am bitten by an alien on a supply run, I begin to dream of things not of this world—and will soon find that my life is about to change forever.