Awaken — Meg Cabot

Death has her in his clutches. She doesn't want him to let go.

Seventeen-year-old Pierce Oliviera knew by accepting the love of John Hayden, she'd be forced to live forever in the one place she's always dreaded most: the Underworld. The sacrifice seemed worth it, though, because it meant she could be with the boy she loves.

But now her happiness -- and safety -- are threatened, all because the Furies have discovered that John has broken one of their strictest rules: He revived a human soul.

If the balance between life and death isn't fixed, both the Underworld and Pierce's home back on earth will be wiped away. But there's only one way to restore order. Someone has to die.