Trampolining with Dragons

What does a girl do when the it turns out the monster who killed her family ISN'T the worst thing out there?
Tara has finally cornered the vampire-bastard who killed her family, only to face a cold hard truth. This monster isn't the only thing that goes bump in the night. There is something far worse out there.
Choose the lesser monster.
There is a great evil - one of the original evils, actually - and it also has Tara's vampire in it's sinful sites. Normally Tara would tell this new evil to get in line ... the vampire is her's to kill. But even she cannot deny that if this new evil gets its way, things would get a lot worse for the world. As in apocalyptically so...
To destroy it, Tara must fight by the vampire's side.
But joining forces with her greatest enemy may prove to be too much to bear, especially when he revenge she craves so deeply is almost within her grasp.
If Mercy Thompson or Buffy ever managed to get a dragon, they'd be working with Tara Drake.