Hereafter by Beth D. Carter

Charlotte Perth has been sent to Missouri to find the bodies of three missing women and she’s dragging her new injured boyfriend, Jonas Daire, along for the ride. Only when she arrives in Rock Ridge does she realize that Agent Nash McKnight has been sent to protect her, and his nearness is driving her absolutely crazy.
As if having to deal with a wacky Southern Belle who’s channeling more than the dearly departed, the local sheriff who’s convinced she’s the murderer, and an underground sex club wasn’t challenging enough. Now she’s got to worry about her unwanted attraction to Nash as they go undercover to ferret out a killer.
Charlotte doesn’t want to betray Jonas, but she’s not quite sure how to squash her feelings for Nash. And just when she thought she might have it all figured out, a secret she uncovers is enough to put her on the murderer’s high priority list.