A Glorious and Devilish Expanse by Katie McGarry

Three prophecies. Two queens. One love.
Hour zero.

The world teeters on the brink of a fated apocalypse and time is running out. The Fae have one chance to save the earth from the demons that seek to possess its inhabitants…but there is no promise of victory when three prophecies foretell three outcomes—all with separate victors.
Worse, Cassie is without Orion, who has fallen prey to a scheming demon prince and transformed into her most deadly foe. Racing against the clock to fulfill the only prophecy that will keep them alive, she must find a spell that will bring the young queens into their full power before war is upon them.
But as the world crumbles to dark forces, alliances are broken, sides are swapped and enemies descend in all forms. Without Orion at her side, Cassie’s darkest hour looms. The only hope she has is to convince Orion that his heart belongs to her, her soul belongs with his, and that they are fated to be together, in love, for the rest of their lives.
For as long—or as little—as those lives might still last. Or everything they fought to save will be forever lost.