Arc of a scythe

"A world with no hunger, no disease, no war, no misery: humanity has conquered all those things, and has even conquered death. Now Scythes are the only ones who can end life-and they are commanded to do so, in order to keep the size of the population under control. Citra and Rowan are chosen to apprentice to a scythe-a role that neither wants. These teens must master the 'art' of taking life, knowing that the consequence of failure could mean losing...

"Citra and Rowan have disappeared. Endura is gone. It seems like nothing stands between Scythe Goddard and absolute dominion over the world scythedom. With the silence of the Thunderhead and the reverberations of the Great Resonance still shaking the earth to its core, the question remains: Is there anyone left who can stop him? The answer lies in the Tone, the Toll, and the Thunder"--