Merripit House is Stapleton’s isolated residence on the moor and the setting for a decisive shift from watchful approach to urgent rescue. Its rooms and outbuildings conceal what its visitors cannot initially see; the fog and surrounding slopes make the house both a target of surveillance and a place of danger.

Setting and Approach

On a map of the district, Sherlock Holmes identifies a house that may be the naturalist Stapleton’s residence among a sparse scattering of dwellings around Baskerville Hall. Later, as the party approaches Merripit House, its lights appear ahead across the gloomy slopes near Grimpen Mire. Holmes identifies it as the end of their journey and instructs the others to walk softly and speak in whispers. They advance along the track but halt about two hundred yards from the house, turning the approach into a concealed watch.

The landscape complicates that watch. A dense white fog hangs over Grimpen Mire and drifts towards the party, banking up like a low wall. In the moonlight it resembles a broad, shimmering field, with distant tors rising above it. The advancing fog puts pressure on Holmes’s plan: the surrounding terrain does not merely frame the house but threatens to obscure the people waiting outside it.

Surveillance and Concealed Activity

From behind the low wall around the stunted orchard, Dr. Watson watches through an uncurtained window. Inside, Sir Henry Baskerville and Stapleton sit smoking cigars with coffee and wine before them. Stapleton talks animatedly while Sir Henry appears pale and distracted, but the ordinary appearance of their meeting is interrupted when Stapleton leaves the room.

Watson hears a door creak and boots on gravel, then sees Stapleton stop at an outbuilding in the orchard. He unlocks it, enters briefly, and returns to the house after Watson hears a curious scuffling from within. The brief, locked-room visit supplies a concrete sign that Merripit House’s grounds contain activity hidden from the apparent hospitality indoors. Watson reports what he has witnessed to Sherlock Holmes, who is also trying to establish where Beryl Stapleton is: she is not in the room with the two men, and no other room appears lit apart from the kitchen.

Search and Rescue

When the party later enters Merripit House, its front door is open. Sherlock Holmes takes up a lamp, and the search proceeds from room to room, startling an elderly manservant. They find no sign of Stapleton. Upstairs, however, one bedroom is locked, and movement can be heard within. Inspector Lestrade calls for the door to be opened; after Holmes forces it, the searchers find not the fugitive they expected but Beryl Stapleton bound and gagged.

The room’s use is an unsettling counterpoint to its contents: it has been arranged as a small museum, with glass-topped cases displaying Stapleton’s collection of butterflies and moths. A post supports an old timber beam across the roof, and Beryl has been tied to it. The rescuers free her, and she collapses to the floor, exhausted and faint. The discovery makes the house’s concealed interior the scene where the search for Stapleton gives way to the rescue of his captive wife.

Narrative Significance

Merripit House brings several kinds of concealment into one place. From outside, the lit windows offer Watson a view of an apparently calm domestic visit; the orchard outbuilding and locked upper room reveal that the visible scene is incomplete. The house’s domestic rooms, its secluded grounds, and the private museum all become parts of an unfolding investigation rather than a stable refuge.

Its position beside the fog-covered Grimpen Mire also links built space to the hazards of the moor. Holmes’s party must approach quietly, observe without being seen, and then search quickly as the fog advances. The final discovery of Beryl Stapleton changes the meaning of the house: what had served as Stapleton’s home and a site of secret activity is exposed as a place of captivity, and the investigation’s immediate purpose becomes her rescue.