Mark Gatiss - Mycroft and creator/writer for the show - was interviewed, and had this to say on his ideas for the episode:
“For Hound, I wanted to make it as scary as possible, and for it to be a proper horror story. But what didn’t feel right was making it a haunted house story. So I realised that the thing we’re most afraid of nowadays is faceless government and conspiracy theories.
“There’s a conspiracy theory about everything and they’re almost the modern equivalent of ghost stories. And the great thing is, you can have all the tropes of a ghost story. So rather than Baskerville being a big spooky house, it’s a facility like Porton Down [the secretive UK military site], with dark rumours about the ‘things’ they’re breeding there.”
http://www.radiotimes.com/news/2012-01-08/mark-gatiss-on-writing-the-hounds-of-baskerville
In the article, he also discusses Doyle's work as well as his thoughts on other adaptations of "Hound."
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I really enjoyed the episode. Even though it was a television programme, it unnerved me more than the all of the horror films of the past twenty years combined. The crew understood the importance of atmosphere and succeeded in creating a dark atmosphere through the lights, framing, in addition to the locations.
Plus, I enjoyed the cultural and historical subtext for it, and thought that Henry gave a terrific performance. I really felt bad for him at the end of the episode. Speaking of bad...how about Sherlock's experiment? If I was the victim, I would have been super pissed.
On a disconnected note, did anyone else notice a
Wicker Man vibe? The selection of the townspeople, the locations, as well as the quirkiness of the community reminded me strongly of Sumerisle.
However, I am curious about the cameo at the end. What was/when he was arrested? Was it a result of the contents on Adler's phone? Also, did anyone see that he hacked John's blog? Check it out...of course, the video might not work, as BBC's embedded player is very, very picky.