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Just so you know, I'm checking into the Plaza,
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and you're paying.
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Okay, Castle, I'm here. What was so important?
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Your first clue is...
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the curious incident of the dog in the nighttime.
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Oh, jeez, Castle. I haven't even had my coffee yet.
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Thank you.
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From the Sherlock Holmes story, "Silver Blaze."
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Holmes unmasks the murderer because of what didn't happen.
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The dog didn't bark.
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That's how he knew the dog must have known the killer.
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Okay. Yes, I remember the story.