Sherlock S2 E2

Sherlock  and John receive a visit from Henry Knight , who witnessed his father's death by a "gigantic hound" at Dartmoond 20 years ago. After years of therapy, Henry visited the site again, only to see the hound again, prompting his request for help. Though initially dismissive, Sherlock is soon interested by Henry's use of "hound" instead of "dog". Sherlock and John arrive in Dartmoor to find the hound is a local legend. They visit Baskerville, a nearby MOD research base, using Mycroft's security pass. After Mycroft's credentials cause a security alert, Dr. Bob Frankland vouches for Sherlock's identity, despite knowing the truth. Frankland says he was a friend of Henry's father and is concerned for Henry's well-being.

Henry tells John and Sherlock about the words "Liberty" and "In" in his dreams. Sherlock, John, and Henry then visit the hollow in the hope of finding the hound. On the way, John notices what seems to be Morse Code . When Sherlock and Henry arrive at the hollow, they both see the hound. At a local inn, Sherlock is visibly shaken and confesses he saw the hound. John tries calming him, suggesting he is imagining things. Sherlock reacts with anger, denying there is something wrong with him. John tries to interview Henry's therapist, Louise Mortimer . However, they are interrupted by Frankland, who blows his cover. Meanwhile, Henry hallucinates the hound is stalking his home.

The next morning Sherlock realises "hound" may be an acronym rather than a word. The pair run into DI Lestrade who was sent by Mycroft to keep an eye on Sherlock. They interrogate the innkeepers about a past order for meat that John has spotted, which struck him as odd for a vegetarian restaurant. The innkeepers kept a dog on the moor to boost the tourist trade, but assure the investigators they had put it down. This explanation satisfies Lestrade but not Sherlock, who insists the dog he saw was monstrous. Calling Mycroft, Sherlock gains access to Baskerville again. Searching the lower levels of the genetics labs, John finds himself trapped and then hears growling which he assumes is the hound. Locking himself in an empty cage, he calls Sherlock, who rescues him. Sherlock deduces a chemical weapon designed to trigger violent hallucinations was responsible. Retreating into his "mind palace", a memory technique, Sherlock realises "Liberty" and "In" stands for Liberty Indiana. After viewing confidential files, he sees "H.O.U.N.D." was a secret C.I.A project aimed at creating a hallucinatory anti-personal chemical weapon, but the project was abandoned several years before. Sherlock realises Frankland, who participated in the project, has continued it in secret.

After John receives a call from Mortimer that Henry has run off with a gun, John, Sherlock and Lestrade run to the hollow to find Henry about to commit suicide. Sherlock explains the hound was an hallucination; his father was actually killed by Frankland, who was wearing a gas mask and a sweatshirt with "H.O.U.N.D. Liberty, In" on it; a child could not cope with this, so his mind tricked him. Every time Henry came back, Frankland gassed him with the hallucinogen; the chemical agent is the fog they encountered at the hollow, triggered by pressure pads in the area. As Henry calms down, they all see the innkeepers' dog, also affected by the gas; John shoots it. Sherlock finds and catches Frankland at the scene. Henry realises that Frankland murdered Henry's father, because he found him testing the drug. Frankland flees into the base's minefield and gets blown up. As Sherlock and John prepare to leave the next morning, John wonders why he saw the hound in the lab despite not having inhaled the gas from the hollow. Sherlock surmises that John was poisoned by the leaking pipes in the laboratory, and John realises Sherlock locked him in the labs in order to test his theory. He also points out Sherlock was wrong for once; he believed the drug was in Henry's sugar and put it in John's coffee.

In the closing scenes, Mycroft oversees the release of Jim Moriarty from a holding cell in which he has written Sherlock's name all over the walls

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