Sounds good! I've been reading Goblet of Fire, and I was reminded of how Barty Crouch's mother sacrificed herself to get her son out of Azkaban. It was so sad, she was dying from grief!
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Also I liken this to Malfoy's mother, who pretended to be evil and devoted ,but trully wanted nothing more than to protect her son! So ya, Valencia's grandmother should definately be good and bestow on Valencia the task of protecting the book's secret......
As to the origins of the book..... have you ever watched The Mummy? where they found that Egyptian book of the dead? It could be something like that.... found during an excavation, stolen or passed down or bought by Valencia's familiy..... It is indestructable except when Valencia discovers it's one weakness and burns it...
Just a though.. one of many!
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