Guardians (Book 3 of the Seers Trilogy)

A vision of Kate's death causes Patrick to intensify his duties as Guardian. The Demon Lord is especially relentless now that Kate is the only Seer to ever escape his grasp. When Patrick discovers that Kate is the key to defeating their greatest enemy, he must choose between sacrificing the girl he loves or letting the Demon Lord win. You won't be able to put this final installment in the Seers trilogy down.