Witching Hour (Between the Veils Series, Book Four) by Kris Norris

A house with a bloody history. A series of unanswered deaths. And it all starts at the stroke of twelve...

Cal Smith has spent his life studying the paranormal. Then a brutal investigation of one of Salem’s most notorious homes sends him packing. He chalks it up to higher education, all too aware he’s simply running from a past that haunts his every waking moment. But when an old friend turns up in trouble, he has no other choice but to revisit his previous work, and face the ghosts he’s shut out for the past ten years.

Jordan Harper has a knack for getting into trouble. Though curiosity is supposed to have killed the cat, she’s well on her way to having the old saying rephrased. And when yet another plan goes horribly astray, she awakens to find that the one man she’d never counted on seeing again—the one man she’d never been able to forget—is now her only option for freedom. She knows asking him to help is probably a bigger mistake than the one she’s just made, but her heart isn’t listening.

Their unexpected reunion might solve a century’s old mystery—or it might be the catalyst that sends them both to an early grave.