Who interrupts the chat between Sherlock and Watson in the novel The Sign of Four?

The entrance of the landlady, Mrs. Hudson, bringing the calling card of Miss Mary Morstan interrupts the chat between Sherlock and Watson.

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As The Sign of Four opens, Sherlock Holmes and Watson are involved in a vigorous discussion. Watson is concerned about Holmes's cocaine habit, which emerges when he does not have a challenging case to occupy his attention. Holmes also stuns Watson with how much he is able to deduce about...

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As The Sign of Four opens, Sherlock Holmes and Watson are involved in a vigorous discussion. Watson is concerned about Holmes's cocaine habit, which emerges when he does not have a challenging case to occupy his attention. Holmes also stuns Watson with how much he is able to deduce about Watson's brother merely from examining a pocket watch. Watson goes so far as to accuse Holmes of having done research on his brother and only pretending to figure out what he did from the watch itself. This motivates Holmes to show Watson in detail everything the watch revealed.

Holmes states to Watson that life is a dull, dreary business except for the life of the mind, asking what else there is to live for but "brain-work." He asks what use there is in having extraordinary powers of analysis when there is nothing but a "prosaic" and "commonplace" world outside his door. Watson is preparing to refute him when Mrs. Hudson, the landlady, knocks on the door. She delivers a calling card from a Miss Mary Morstan, who is waiting down below. Holmes has Miss Morstan ushered up, not knowing this is the start of a case that will fully occupy his extraordinary mind.

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