Celeste Rayne feels death catching up with her, but she can't forget about the medical notes and the stress bakes that keep her up at night. Then one night, a lonely king pays her a visit with a hundred-year curse to cut a deal: break his curse, heal her heart. Scared of losing her life, she says yes without knowing any details—and now assassins are closing in from every side of the world. She's trapped in the Underworld with his fiancée promising her a slow death, and they're keeping secrets that will destroy them both. As their lives are threatened and forbidden desire follows, a love that's killing them both ignites. Celeste discovers she's the reincarnation of his first love. And breaking the curse will cost her the one thing she has left—her humanity. "What's the catch?" "Trust the devil." Can loving him erase everything she is, or will loving each other save them?