Watson is discovered as the doctor in charge of a retreat for convalescent officers, Hulstone Towers Northumberland, ancestral home of the Musgraves, haunted by ghosts and the wailing of lost souls are heard on the limewalks. The Musgraves have "opened their home" to these patients, but it is a grim, cheerless place.

Sexton the doctor assisting Watson is stabbed by an unknown person; and the clock in the tower strikes thirteen, an event local legends say precedes the death of a Musgrave.

Watson decides to hurry back to London and consult with Holmes. Holmes returns with Watson to Musgrave Manor, and his immediate impression is one of foreboding: "Houses, like people, have definite personalities and this place is positively ghoulish!"

Based on the story The Musgrave Ritual by Sir Arthur Conan Doyle.

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