The Night Signal
The Hound of the BaskervillesThis subplot traces Watson’s suspicion of the Barrymores to the discovery that their nocturnal signal serves Selden rather than a plot against Henry.
increasing
Bearing strength in each event
decreasing
A Shadow in the Corridor

A Shadow in the Corridor
A furtive walk
Watson sees John Barrymore carrying a candle through the dark house toward an unused room.
A moor-facing window
The butler stands watching the darkness as if waiting for a response.
Watson suspects a secret connection outside the Hall.
The Repeated Vigil

The Repeated Vigil
Watson waits with Henry
The two men stay awake and follow Barrymore when he repeats the journey.
A signal answered
Watson moves the candle and sees a small distant light respond from the moor.
The suspicion of conspiracy gains apparent proof.
The Secret Confessed

The Secret Confessed
A wife steps forward
Eliza admits that the distant light is Selden’s and that John carries him food.
The motive changes
The nighttime behavior comes from family compassion, not hostility toward Henry.
A tense accusation gives way to reluctant understanding.
The Chase Across the Moor

The Chase Across the Moor
Henry acts immediately
Henry and Watson set out to seize Selden, judging him a danger to isolated neighbors.
Fear interrupts pursuit
A strange cry makes them fear that another predator is loose on the moor.
The rescue attempt ends with Selden’s escape and Watson’s sighting of a watcher.
Mercy and Its Cost

Mercy and Its Cost
A family protected
Henry declines to report the Barrymores’ assistance, recognizing their motive and Eliza’s grief.
Compassion carries consequences
Selden later dies because the clothes they gave him expose his scent to the hound.
Kindness offers no protection from Stapleton’s machinery.
Watson’s first night at Baskerville Hall
Two nights after Watson’s first observation
Immediately after the signal is noticed
The same dark night
After Selden’s death