'The Hound Of The Baskervilles' was the perfect Sherlock Holmes story for Hammer to adapt, the most gothic and bloodthirsty of Arthur Conan-Doyle's tales. Even so, the ante was upped with the introduction of deadly tarantulas, a female villain, lots of gunplay and a webbed hand.
Peter Cushing makes for a brilliant Holmes - waspish, good humoured, bright eyed - but perceptive and ready to act at all times. Andre Morell is a pretty good Doctor Watson, too, quiet, reliable, handy with a pistol. The film is directed by the supremely capable Terence Fisher, and moves along briskly and convincingly, and the story is adapted well and slightly sexed up without the need for a load of bullshit about hallucogenic gas and mind palaces that so marred the recent TV adaptation / reinterpretation.