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I'm looking for a Nancy Drew book. I don't know what era it was from, but I was reading an old paperback copy in the early 2000s.
I think it concerned an art gallery. One character had the surname O'Hoops or something like it. Nancy finds a pad of paper and lightly rubs a pencil over the top page, revealing the indentation of a note that had been written earlier and contained a crucial clue. Soon afterwards, she reveals a character to be a member of the O'Hoops family.
I understand if no one gets it based on such minor details. I can't find anything about it online, so I'm just hoping someone else read it as a kid.