Scythe - Neal Shusterman
Scythe is set in a futuristic utopia, where all of the world's problem's have been fixed. Revive centers can save the dead, hunger has been ended, everyone leads a comfortable life. The only problem left is population control. Scythes glean people, killing them, and no one will revive them. Two people are chosen as apprentices; neither of them want to be sythes, but ultimately one will take the position of scythe. This is definitely a good book worth your time to read, filled with adventure and action.