Jake Lonergan wakes up in the middle of the night, without having to remember anything: neither his name nor how he came to this place, and certainly not why he wears this strange metal band.
In the next place he makes a stir when he recognizes himself as the spoiled son of the local livestock wholesaler. The sheriff finally recognizes him as a wanted criminal and imprisons him.
But when a horde of aliens suddenly attack the village and kidnap several people, for Lonergan. They offer a chance for rehabilitation, because the bracelet turns out to be a powerful weapon. Together with the remaining residents, he goes on to hunt the aliens.