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It think it would be really cool if we see a modern version of the “Adventure of the Sussex Vampyre.”
Considering that Gatiss is said to be a horror fan, it would be interesting to see what they would do with it. I do know that the Granada series with Jeremy Brett did a pastiche of the original story as a feature film called “The Last Vampyre.”
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I'm writing a fic called 'The London vampire' but it's based on another canon story. I do like the story, though, it plays with expectations a bit.