The theme of 'The Adventure of the Blue Carbuncle' is about good deeds leading to great rewards, supported by a detail from the text.
Theme: The theme of 'The Adventure of the Blue Carbuncle' is With good deeds often come great rewards. This is evidenced in the story when the lost gem is returned, and the finder is rewarded generously.
Detail: The detail from the text that best supports this theme is 'Chance sent us a most entertaining problem....' This indicates that the unexpected discovery led to a positive outcome.
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