Before the Devil Knows You're Dead by Patricia Eimer

Not Even Death Can Keep a Good Demoness Down

There's never an end to the crazy when you're demon spawn. Not that Faith Bettincourt's complaining. She's been patching things up with her angelic on-again off-again boyfriend, Matt, and her best-friend-turned-sister-in-law is soon giving birth to the Anti-Christ Part Deux. Oh, and Faith is saving kids from Death in her pediatric unit, one soul at a time. Life is good.

Or at least it is until Faith accidentally runs over the Angel of Death and is forced to take his place. Now she's taking lives instead of saving them. This is kind of a problem when you're a nurse. As if that weren't bad enough, she is suddenly thrust into the worst scenario of them all–Matt's ex is back, and she's brought the Apocalypse with her.

Faith's not about to give up the world...or her man. But when the chips are down, what's a girl to do but take matters in her own hands, consequences be damned?