[s2e2] The Hounds Of Baskerville Apr 2026

Sherlock realizes the drug isn't in the sugar or the water—it’s in the of Dewer's Hollow.

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

Sherlock, initially dismissive, is hooked when Henry mentions "hound"—a word that triggers a strange flicker in Sherlock's own mind. The Beast of Baskerville Sherlock realizes the drug isn't in the sugar

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. He confesses to John that he saw the hound

The investigation centers on , a top-secret military research base nearby. Rumors of genetic mutations and "super-dogs" swirl among the locals. Using Mycroft’s high-level security clearance (stolen, of course), Sherlock and John infiltrate the facility. They encounter Dr. Stapleton , a geneticist with a missing glowing rabbit, and Dr. Frankland , a friendly scientist who was a close friend of Henry’s father.

The chemical is a volatile, aerosolized fear-gas developed at Baskerville (Project H.O.U.N.D.). It targets the brain’s fear centers, turning a suggestion—a "hound"—into a vivid, lethal hallucination. Sherlock’s Mind Palace reveals that "H.O.U.N.D." was an acronym for the scientists who created the gas in the 1960s. The Confrontation at the Hollow