Are you sure about the whistle and the sound of falling metal? asked Holmes.
I think so, answered Helen. But it was a very wild, stormy night. Perhaps I made a mistake. The police couldn't understand why my sister died. Her door was locked and nobody could get into her room. They didn't find any poison in her body. And what was "the speckled band"? Gipsies wear something like that round their necks. I think she died because she was so afraid, but I don't know what she was afraid of. Perhaps it was the gipsies. What do you think, Mr Holmes?
Holmes thought for a minute. Hmm, he said. That is a difficult question. But please go on.