Scythe (1) (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--