Bringer of Darkness

Set a century after Twilight. Bella was turned into a vampire by the Cullens and now works for the Volturi. Jasper, the Bringer of Darkness, is the most feared vampire. He ran the southern wars after Maria was killed before branching off on his own. What happens when Bella is tasked with bringing him down? Will she catch him and what happens if she does? DARKSPER/BADASS-BELLA