Sir Henry: I can understand someone wanting to steal a pair of boots - but one? So there it is.
Sherlock Holmes: Do you imagine that I can prevent the Powers of Darkness?
Sherlock Holmes: My professional charges are upon a fixed scale. I do not vary them, except when I remit them altogether.
Sir Hugo Baskerville: Let the hounds of Hell take me if I can't track her down!
Doctor Richard Mortimer: But this is remarkable!
Sherlock Holmes: Superficial. There is nothing remarkable about using one's eyes.
[to Sir Henry Baskerville]
Sherlock Holmes: I must insist upon one thing. Under no circumstances are you to go out onto the moors at night.
Sherlock Holmes: Elementary, my dear Watson. Tarantulas are not from South Africa.
Sherlock Holmes: It's elementary, my dear Watson, elementary...
[Extending it to Watson]
Sherlock Holmes: Muffin?
Doctor John Watson: Thank you.
Stapleton: What do you expect to find down here, Mr. Holmes?
Sherlock Holmes: What one expects to find under the ground. Bones, perhaps?
Bishop Basil Frankland: Bishop of the Upper Isles... for what they're worth.
Sherlock Holmes: There is more evil around us here than I have ever encountered before.
[of Sir Henry Baskerville]
Sherlock Holmes: I warned him! What could have possessed him to come out here alone?
[on meeting Dr. Watson]
Bishop Basil Frankland: I knew a Watson once, a white slaver...
Sherlock Holmes: In a case such as this, everyone is suspect - even Sir Henry.
Sherlock Holmes: The dagger's gone! Don't you realize what that means? Sir Henry is to die tonight!
Sherlock Holmes: The powers of Evil can take many forms. Remember that, Sir Henry, when you're at Baskerville Hall. Do as the legend tells and avoid the moor when the forces of darkness are exalted.
Sherlock Holmes: Sir Henry, keep perfectly still...
[Pointing to him]
Sherlock Holmes: if you value your life.