[s2e2] The - Hounds Of Baskerville

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.

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. [S2E2] The Hounds of Baskerville

Determined to find a rational explanation, Sherlock realizes the "hound" isn't a physical creature, but a . He suspects a chemical agent and tests John by trapping him in a Baskerville lab, triggering a terrifying "encounter" with the beast through the base's sirens and lights. The Revelation of the Fog They rush back to the Hollow to find

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. Back at the inn, the unthinkable happens