It’s springtime in the Scottish Highlands and a bonfire blazes against the night sky. A group stands before the flames, passing around a hat containing slices of bannock, or griddled oatcake. Each person plucks out a piece, until one unfortunate soul unfurls his fist to reveal a charcoal-daubed morsel. Fate has declared him the cailleach Bealtaine, a scapegoat who must be sacrificed. Some of his companions grab him, pulling him toward the fire. For good measure, they might even lay him out and prepare to draw and quarter him. At…