The country doctor had come to 221B Baker Street, the famous lodgings of Sherlock Holmes, with an eerie tale – the legend of the Hound of the Baskervilles, the devil-beast that haunted the lonely moors around the Baskervilles' ancestral home. The tale warned the descendents of that ancient family never to venture out on the moor "in those dark hours when the powers of evil are exalted."...