When the death of his uncle brings Dr. John Watson to the eerie estate of the Baskervilles, he and the famous detective Sherlock Holmes must unravel the mystery of a vicious dog, a hidden doorway, and a series of attempted murders. As they dig deeper, they discover a web of secrets and sinister forces lurking in the shadows of London.

When a serial killer begins targeting young women, Sherlock Holmes and Dr. Watson are called in to assist with the investigation. They discover a dark secret involving high society and must solve the case before more lives are taken.