Thunderhead (Arc of a Scythe #2) by Neal Shusterman

Humans learn from their mistakes. I cannot. I make no mistakes.

The Thunderhead is the perfect ruler of a perfect world, but it has no control over the scythedom. A year has passed since Rowan had gone off grid. Since then, he has become an urban legend, a vigilante snuffing out corrupt scythes in a trial by fire. His story is told in whispers across the continent.

As Scythe Anastasia, Citra gleans with compassion and openly challenges the ideals of the “new order.” But when her life is threatened and her methods questioned, it becomes clear that not everyone is open to the change.

Old foes and new enemies converge, and as corruption within the Scythedom spreads, Rowan and Citra begin to lose hope. Will the Thunderhead intervene?

Or will it simply watch as this perfect world begins to unravel?