Scythe

It's the future. Everything is great. An incredibly powerful AI known only as the Thunderhead has taken over the world, and is hell-bent on making life good for everyone. There's no more war, no more poverty, no more disease, and no more death. With one exception.

The Scythes (pronounced SKITH-ees) are an organization of people who are tasked with keeping the population in check by killing ("gleaning") people. They are the most revered and feared members of society. Citra and Rowan are two of the minority of people who outwardly disapproves of the Scythes, which sucks for them, because a wise old Scythe named Faraday has appointed them as apprentices.

Now, Citra and Rowan have to compete with each other to see who gets to become a Scythe. Except, neither one actually wants the job. But they both kinda do. It's good fun. Also, there's this whole thing with these Scythes who are holding "mass gleanings," which are exactly as terrible as they sound. I hope those guys don't cause any trouble.

Neal Shusterman's Scythe is a pretty fun book. The story is a whirlwind, with mysteries that had me genuinely second-guessing myself throughout the book. Seeing the separate journeys of Citra and Rowan as they learn how to kill is cool. It's apparently the first book in a trilogy, but the ending is actually really satisfying, so it can stand entirely on its own. Scythe also pokes at some really interesting issues about death and longevity and utopia. If you like a bit of action, a bit of mystery, and a lot of murder, then you should pick up Scythe.