They rush back to the Hollow to find Henry on the verge of suicide, driven mad by the gas. Sherlock explains the truth: Henry didn't see a monster twenty years ago; he saw in a gas mask and a "H.O.U.N.D." t-shirt, murdering Henry's father over the secret of the gas. Henry’s child-mind interpreted the mask and the red goggles as a demon dog.
The story begins with , a man haunted by a twenty-year-old memory. As a child, he watched his father torn apart in "Dewer’s Hollow" by a monstrous, red-eyed hound. The trauma has festered into an obsession, drawing Sherlock Holmes and John Watson away from the boredom of London and into the eerie, mist-laden landscape of Dartmoor. [S2E2] The Hounds of Baskerville
As the fog rolls in, Frankland appears. He has leaked the gas again to finish Henry off. In the chaos, a common stray dog (enhanced by the gas to look like a monster) is shot by John and Lestrade. Frankland flees but wanders into a Baskerville minefield, meeting a fiery end. The Aftermath They rush back to the Hollow to find
Back at the inn, the unthinkable happens. Sherlock Holmes—the man of pure logic—is trembling. He confesses to John that he saw the hound. For the first time, Sherlock cannot trust his own senses. This doubt leads to a breakdown of his "Mind Palace," nearly destroying his friendship with John as he lashes out in fear. The story begins with , a man haunted
This retelling of dives into the psychological fog of Dartmoor, focusing on the intersection of childhood trauma and modern chemical warfare. The Ghost in the Fog
The story closes with a chilling realization. Sherlock’s "Mind Palace" vision of in a prison cell was actually a lingering effect of the gas—a shadow of his greatest fear. As Henry finally finds peace, the episode ends with a teaser: Mycroft releasing Jim Moriarty from a holding cell, where the villain has written "SHERLOCK" all over the walls. O.U.N.D. project?
That night, Sherlock and Henry venture into Dewer’s Hollow. In the darkness, amidst the swirling mist, they see it: a massive, snarling beast with glowing eyes. The Great Detective’s Doubt