Swan Song

The inhabitants of the secluded collection of towns. called Pandora. aren't like all other people. When a Pandorian is born, a being called an angel appears and bonds to the child. These bonds last until either the angel or the human dies. Each angel has its own special ability, which the Pandorians keep hidden from the outside world, scared of what might become of them afterwards. Because they are born with angels, they've decided to make preachers the leaders of the town, and the Baskerville family has had that duty for generations. Every time a preacher's firstborn turns fifteen, they are assigned a difficult task, and only prove themselves worthy of inheriting the title of preacher by successfully completing it.
The current preacher's firstborn son, Lock, just turned fifteen, but his task is unlike the others they've received. He must travel to the few neighboring towns in search of the serial killer nicknamed the Head Hunter, because of their predisposition for decapitation. Not only is his task more difficult and dangerous than any others, since the killer seems to be using an angel to commit the murders, he also doesn't even wish to become the current preacher, finding the community of Pandora archaic, as a result of them being cut off from the outside world for so long. Still, knowing the consequences of avoiding his duties, he accepts the task.
On his journey, he discovers several mysteries about his town, realizing the danger is bigger than he thought.