After surviving personal danger in an abandoned tin mine while looking for evidence of a hound, Holmes is able to guess who unleashed the hound in pursuit of Sir Charles and why they did it. Believing that a trap has been set for Sir Henry, the detective and his assistant accompany him to the moor where Sir Henry had met Cecile. When Sir Henry meets Cecile this time, though, she rejects him, finally revealing that she and her father are also descendants of Sir Hugo Baskerville, planning to claim the inheritance as their own once Sir Henry is out of the way. The hound appears and attacks Sir Henry. Stapleton attacks Watson with the legendary curved dagger used by Sir Hugo, but Watson shoots and wounds him. Holmes shoots the dog; it then turns on Stapleton and mauls him to death. Cecile flees after Holmes kills the beast, revealing it to be a Great Dane wearing a hideous mask to make it look more terrifying. Cecile tries to escape across the moor, only to fall into the Grimpen Mire and she sinks into the mud to her death. Sir Henry now can claim his inheritance in peace, and Holmes and Watson return to London.