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After discussing the mysterious whistle, the sisters exchange a few light words and part for the night. Julia closes her door and turns the key. Holmes interrupts Helen's account to ask whether they always locked themselves in at night. Helen explains the precaution by referring to the animals her stepfather allows around the grounds.
"'Very likely. And yet if it were on the lawn, I wonder that you did not hear it also.'
「『ありそうなことね。でも、もし芝生で鳴っていたのなら、あなたに聞こえなかったのが不思議だわ』
"'Ah, but I sleep more heavily than you.'
「『ああ、でも私はあなたよりぐっすり眠るから』
"'Well, it is of no great consequence, at any rate.' She smiled back at me, closed my door, and a few moments later I heard her key turn in the lock."
「『まあ、どのみち、たいしたことではないわね』姉は私に笑みを返して戸を閉め、それから少しして、姉が鍵を回す音が聞こえました」
"Indeed," said Holmes. "Was it your custom always to lock yourselves in at night?"
「なるほど」とホームズは言った。「夜はいつも、鍵をかけて閉じこもるのが習慣でしたか?」
"Always."
「いつもです」
"And why?"
「なぜです?」
"I think that I mentioned to you that the Doctor kept a cheetah and a baboon. We had no feeling of security unless our doors were locked."
「博士がチーターとヒヒを飼っていると、お話ししたと思います。戸に鍵をかけていないと、安心できなかったのです」
"Quite so. Pray proceed with your statement."
「もっともだ。どうか話を続けてください」