Was this the right corner to turn?
She stopped and thought.

Yes it was.

Down this passage and then to the left, and then up two broad steps, and then to the right again.

Yes, there was the tapestry door.
She pushed it open very gently and closed it behind her, and she stood in the corridor and could hear the crying quite plainly, though it was not loud.

It was on the other side of the wall at her left and a few yards farther on there was a door.