When Henry Knight visits 221B Baker Street with a tale of disappearance on Dartmoor twenty years ago, Sherlock Holmes isn’t particularly interested – until he hears about the top-secret Baskerville military research facility and the footprints left on the moor by a gigantic hound.

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Written by Mark Gatiss, The Hounds of Baskerville airs at 8.30pm on Sunday 8th January.

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