When she had gone, Holmes sat back in his chair.

"What do you think about the woman's story, Watson?" he asked.

"It all seems very strange."

"Yes, it is very strange indeed."

"If the woman is right, no-one could come through the walls or floor. The door and windows were locked, and nothing could go through the chimney. So the sister was alone when she died. It's very strange."

"And what do you think of the whistles at night. Also what do you think about the sister's strange words before she died?

"I really don't know".

"We must think about the whistles at night. Also we must think about the gypsies who are very friendly with this doctor. And we know that the doctor will lose quite a lot of money when his stepdaughter gets married."