Sherlock Holmes i doktor Watson szukaja sprawców zabójstw w rodzie Baskervillów. Tropia straszliwa bestie i zimnego morderce, narazajac sie na mrozace krew w zylach niebezpieczenstwa na bagnach Grimpen...

Holmes and Watson investigate the brutal murder of a wealthy American, Douglas, living in rural Sussex. A sinister tale of mystery and intrigue is revealed about Douglas's past life as one of the infamous gang called 'The Scowrers', who ruled with terror the coal-fields of Pennsylvania in the 1870s.