Light of the Spirit by Lisa Kessler

The gods never sleep…

As the mortal vessel for the Muse of Comedy, Lia Youlos lights up every room with laughter and smiles. But there are darker forces at work, and they want to snuff out her light forever.
Cooper Hanover is a hardworking paramedic who healed Lia after a fire, but something happened that day, something medical science couldn’t explain. And if he doesn’t figure out how it works soon, the next healing could kill him.
Lia’s smile and sharp wit tempt him to love again, and he’s not going to let anyone, not even the gods, take her from him.