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Miss Stoner did so, and Holmes, after a careful examination

through the open window, endeavoured in every way to force the

shutter open, but without success. There was no slit through

which a knife could be passed to raise the bar. Then with his

lens he tested the hinges, but they were of solid iron, built

firmly into the massive masonry. "Hum!" said he, scratching his

chin in some perplexity, "my theory certainly presents some

difficulties. No one could pass these shutters if they were

bolted. Well, we shall see if the inside throws any light upon

the matter."