It was October the 24th, in the year 1891. that I heard for the first time in four...

[first lines]
Dr. John H. Watson: [Watson rings the doorbell of 221-B Baker Street] It was October the 24th, in the year 1891. that I heard for the first time in four months from my friend Sherlock Holmes. On this particular day, a telegram from his landlady, Mrs. Hudson, had been delivered to my surgery, imploring me to return to my former rooms without delay.
Mrs. Hudson: [Mrs. Hudson opens the front door] Oh, Dr. Watson, thank heavens you've come; I'm at my wit's end.
Dr. John H. Watson: Why, what has happened?
Mrs. Hudson: Since you left us these last few months, he's been very strange. He's barricaded himself up there, he won't take his food, he keeps the oddest of hours. I think he's taking...
Sherlock Holmes: [from his bedroom] Mrs. Hudson! I know there's someone down there with you! I heard the cab stop before the door!
Mrs. Hudson: He keeps babbling on about some...
Sherlock Holmes: [from his bedroom] Mrs. Hudson, if that gentleman answers to the name Moriarty, you may show him up, and I will deal with him!
Dr. John H. Watson: I better go to him.
Mrs. Hudson: [Watson goes up the staircase] Oh, be careful.
Dr. John H. Watson: Moriarty was a name I'd only known him to mutter... when in the thrall of one of his cocaine injections.
[Watson knocks at Sherlock's bedroom door]
Sherlock Holmes: [from within his bedroom] Is that you, Moriarty?
Dr. John H. Watson: It is I, Watson.
Sherlock Holmes: [in his bedroom] Watson?
Dr. John H. Watson: [Sherlock slightly opens his bedroom door a crack, unlocking it] You see it is I. Holmes, let me enter.
Sherlock Holmes: [he closes his door again] Not so fast! You may be Moriarty in disguse. Prove you're Watson.
Dr. John H. Watson: How on earth am I to do that?
Sherlock Holmes: Tell me where I keep my tobacco!
Dr. John H. Watson: Tobacco? Well, as a rule, it's in the toe of your Persian slipper. Holmes...
Sherlock Holmes: [Sherlock opens and unlocks the door] Very well, I'm satisfied.
[Watson enters Holmes's room]