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The Riddle of the Frozen: 'And not a trace of a clue''

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The Riddle of the Mysterious Light: "Isn't that going a little too far—"

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The Riddle of the Night: "What kind of a game is this?"

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The Russian Dancer: "The very oldest device in the art of the amateur blackmailer"

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The Riddle of the Spinning Wheel: "Have you any foundation for believing this?"

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The Riddle of the Purple Emperor: "Their hands met and clasped in the silence"

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Cleek of Scotland Yard: "Now he would get at the facts of the matter"