Question

what did holmes know about the blue stone? ​

Answer 1

Answer:

– because once they all arrive at Baker Street, Holmes reveals that he has found the blue carbuncle in the throat of the goose Ryder's looking for. Ryder confesses that the Countess's maid, Catherine Cusack, told him about the stone.

Answer 2

Answer:

And he might as well – because once they all arrive at Baker Street, Holmes reveals that he has found the blue carbuncle in the throat of the goose Ryder's looking for. Ryder confesses that the Countess's maid, Catherine Cusack, told him about the stone.

Explanation:

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