How is Sherlock Holmes alert?

Sherlock Holmes is the hero of this tale, and its most popular character. From other stories, readers would have known that Holmes is methodical, intelligent, analytical, observant, and reserved. In this novel, he also reveals his ability to match his brooding, thoughtful nature with immediate action. Willing to deceive or mislead others if necessary, Holmes is and antisocial and impersonal fellow who nevertheless comes off as charming and ultimately moral.