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How many supernaturals does it take to screw in a lightbulb? For this particular case, way more than Kyle McKinley has backing her up.

When she stumbles upon a dark museum, missing artwork, and a dead security guard, Kyle and her team are thrust into a new mystery. One involving demons. But not your run of the mill demons—realm demons. Tougher, scarier, and banned from earth, they are escaping from the realm and wreaking havoc in Cleveland, Ohio, of all places.

Now the Feds have shown up, and Kyle has to deal with the one person she prayed she would never see again. Dalton. How can she keep the truth of their past from him without jeopardizing the case? Especially when the Key of Knowledge is part of the mystery. The same Key that almost cost Dalton his sanity and is now threatening hers. Kyle is just starting to get her life back together again with Griffin at her side. And now the Fates are forcing her to choose. But when a demon apocalypse looms on the horizon, her only choice is to embrace the Key to save the world, regardless of what it might cost her.