Keri Wolf has joined the crew of The Seekers, a show that searches for paranormal phenomena, as they explore a supposedly haunted old inn on the road between Philadelphia and Harrisburg. The place is famous for its warm welcome—and infamous for being the site of an ax murder rampage in the 1920s. They’ve barely begun when a very real dead body is discovered in the basement. As a nonfiction author, Keri is supposed to be the rational one, but she...