Facing personal danger in an abandoned copper mine, and thanks to the stolen portrait of Sir Hugo, Holmes is able to guess the Stapletons are illegitimate descendants of Sir Hugo and are next in line to inherit the Baskerville fortune and mansion if all of the Baskervilles perish. Holmes deduces this after questioning Barrymore about the missing portrait; it was stolen because it revealed the fingers on Sir Hugo's right hand were webbed just like Stapleton's. Cecile takes Sir Henry out onto the same place where, according to the legend, the ghost hound had killed Sir Hugo. Holmes and Watson arrive just in time to hear Cecile reveal her intentions to a horrified Sir Henry. The dog attacks Sir Henry. Stapleton attacks with the dagger, but Watson shoots and wounds him. Holmes shoots the dog; it then turns on Stapleton and mauls him to death. Cecille flees after Holmes kills the beast, revealing it to be a Great Dane wearing a hideous mask to make it look more terrifying. Cecile accidentally falls into the mire and sinks to her death. Holmes and Watson take a shocked Sir Henry back to Baskerville Hall.