Blood of Night. The Thorne Hill Series, #9

They say when one door closes, another opens. And in my case, that door leads right to Hell-literally. Though it's not necessarily a bad thing, as crazy as it may sound since this specific hell dimension is ruled by Osiris, God of the Underworld. And he just might be the only one who can help me save the world from the total devastation the Four Horsemen of the Apocalypse will bring. But he's also the only one standing between me and Lucas, who sacrificed everything so I could live.
I'll do whatever it takes to save him, and if anyone gets in my way, blood will spill. In an attempt to keep the world from completely imploding, Osiris wants to make a deal: he'll help free my husband in exchange for me staying in the Underworld with him, ruling by his side. It's not a deal I'd agree to, until I realize how close the archangels are to finding out who I really am. If there's one thing I know about Hell, it's that it makes one hell of a hiding place.