On an isolated isle off the western coast of Scotland, spirited American Jane Wunderly must investigate a secret society where esoteric rituals blur the line between what's real, what's illusion, and what's deadly . . .
Jane, set on solving the crime and catching the next ferry with Redvers, realizes she may be among the few still grasping reality. One high-ranking member searches for the killer by attempting to access otherworldly planes of existence, while others become immersed in a strange solstice ritual. Then there's Nightingale and the rivals who discarded him to start a new temple. As a second death brings fresh clues into focus, Jane needs to navigate a frightening dilemma--playing along won't help her crack the mystery, but revealing too much could be a fatal mistake . . .