368T: Hidden riches turns out to be rare books

I’m looking for a mystery/adventure book I read in the 1980’s in my elementary school library.  I believe it came from the same section where the Nancy Drew, Three Investigators, etc. books were and so could have been published in the 70s, 60s, or before.  I don’t remember if it was part of a series or a stand-alone book.  I believe the main character was a female who was investigating a mystery that involved a mansion.  In the mansion there was a library with lots of books that she would visit.  I don’t remember any of the main plot but the end stuck with me.  The man who owned the house was said to have hidden his riches somewhere.  In a twist at the end of the story the main character realizes the books that are in the library are rare originals (e.g. first-edition Shakespeare, early edition Bible, etc.)  The riches were hiding in plain sight all this time in the form of these rare books.
Can anyone help me locate the title or more information about this book?

7 thoughts on “368T: Hidden riches turns out to be rare books

  1. Ruth pratte

    You might try BELOVED MONSTER by HELEN MARKLEY MILLER. It’s about a girl named Robin who is left a big house from a great uncle. She and three other try to find the treasure that her uncle had hidden.

    Reply
  2. Ruth pratte

    You might try BELOVED MONSTER by HELEN MARKLEY MILLER. It’s about a girl named Robin who is left a big house from a great uncle. She and three others try to find the treasure that her uncle had hidden.

    Reply

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