If you'd like to read more about what Berúthiel and her cats *might* have experienced, you can check out the RPG written by several forum members:
A House Divided. (Unfortunately, the story was not finished, but it's enjoyable reading!)
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth..
.'