Doctor Watson moves in with the eccentric Sherlock Holmes and they get a case to solve. A young heiress seeks Holmes' help when she feels threatened by her brutish stepfather after her sister dies under mysterious circumstances.
Holmes and Dr. Watson help a young lady who is receiving anonymous letters 10 years after her father passed away under shady circumstances. They find themselves in an enigma involving a treasure, murder and a love interest for Watson.
When Sir Charles Baskerville is found dead in his country house, Dr James Mortimer asks Sherlock Holmes for help to save Sir Henry Baskerville, the only known heir, from the curse that haunts Baskerville family.