This must be Kara's underground study, where he kept his precious papers.
A smaller room gave from this and again it was doorless.

She looked in and after her eyes had become accustomed to the darkness she saw that it was a bathroom handsomely fitted.
The room she was in was also without any light which came from the farthermost chamber.

As the girl strode softly across the well-carpeted room she trod on something hard.

She stooped and felt along the floor and her fingers encountered a thin steel chain.

The girl was bewildered-almost panic-stricken.