Holmes and Watson are faced with their most terrifying case yet. The legend of the devil-beast that haunts the moors around the Baskerville family's home warns the descendants of that ancient clan never to venture out "in those dark hours when the power of evil is exalted." Now, the most recent Baskerville, Sir Charles, is dead, and the footprints of a giant hound have been found near his body. Will the new heir meet the same fate?