The Question and Answer section for The Hound of the Baskervilles is a great resource to ask questions, find answers, and discuss the novel.
From the text:
“No, no, sir; no, not against you!” It was a woman’s voice, and Mrs. Barrymore, paler and more horror-struck than her husband, was standing at the door. Her bulky figure in a shawl and skirt might have been comic were it not for the...
Holmes hides out on the moor where he watches and waits without anyone's knowledge. Even Watson doesn't know he is there.
Holmes is able to deduce much about Mortimer: that he is a doctor, for instance although perhaps an unambitious one—and that he is well-liked. Holmes also deduces that Mortimer owns a dog and walks great distances.
