Arc of a scythe

""In a world where disease has been eliminated, the only way to die is to be randomly killed ('gleaned') by professional reapers ('scythes'). Two teens must compete with each other to become a scythe--a position neither of them wants. The one who becomes a scythe must kill the one who doesn't"--

"It's been three years since Rowan and Citra disappeared; since Scythe Goddard came into power; since the Thunderhead closed itself off to everyone but Grayson Tolliver. In this pulse-pounding conclusion to [...] Neal Shusterman's Arc of a Scythe trilogy, constitutions are tested and old friends are brought back from the dead." --