INVOKING: To call on a higher power for assistance or support - Free dictionary. Who kidnapped Glenda Thornheart? Gillette and Ardal try to figure out who snatched their mother and why. Bad juju between the Churchills and the Thornhearts may be at the root of the trouble, but they couldn't be sure. Local folklore offered many versions of the discord between the two oldest families living on Shadow Mountain. Can Gilly and Ardal figure it out and find Mama?