Mr. Henry Baskerville arrives from America to take up his inheritance after the mysterious death of his uncle, Sir Charles Baskerville. Officially, his death had been due to a heart attack, but his body on the moor near Baskerville Hall had by it the footmarks of a giant dog. Could the legend of the Hound of the Baskervilles be true? Watson and Holmes become involved in a terrifying and perhaps supernatural adventure.