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.

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.