When Sir Charles Baskerville is found dead on the moors, a heart attack seems to be the likely cause. However, a certain Dr Mortimer thinks there is more to it than that. Although it seems impossible, he believes that a supernatural hound haunts the moors. His theory suggests that this beast has been on the rampage for years, killing generations of male Baskervilles. With the heir to the Baskerville estate returning home from Canada, and the mystery...