The girlfriend of the son of a rich railroad tycoon, attempts to help him escape the clutches of his well-meaning, but over-bearing mother whilst encouraging her own father not to give up on his business, by instigating a staged kidnapping and black-mailing scheme.

After the death in suspicious circumstances of Charles Baskerville, the last descendant of the lineage of the Baskervilles, Henry, returned to the old family mansion. The charismatic detective Sherlock Holmes and his faithful assistant, Dr. Watson, investigating the case, and discover the existence of a supernatural hound that in addition murderer according to history, killed many years ago Hugo Baskerville, the first of the line, and it seems that the curse stalks his descendants.