Devoted - Hilary Duff - paperback

Elixir book 2 out of 3 - completed series

When love is lost but never forgotten/

Clea Raymond found her soulmate in the mysterious and handsome Sage, discovering that they have loved each other through many past lives, all of which ended tragically. Clea wants nothing more than to prevent history from repeating itself and to be with her true love. But there are dark forces in the world: people who want to destroy Sage and the elixir that makes him immortal. 

Sage has been taken, yet Clea is certain he is still alive and will stop at nothing to find him. Together with her friend Ben, she enters into an uneasy alliance with Cursed Vengeance, an ancient faction that can help lead them to Sage. But Clea must get to Sage before Cursed Vengeance does, or risk his death at their hands. And with Ben's role in Sage's kidnapping, and their past lives, Clea questions whether he can be counted on at all, and if she's really saving Sage, or just leading them to repeat their disastrous pasts all over again.