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What's interesting about these books is that they're written by various authors under the Hardy Boys author's name...Franklin Dixon. If you read a substantial number of these books, you'll see a difference in the intensity of the plots. Some are very sweet and very pleasant but still engaging. Others are sharp and intense and maintain the reader's interest on a different level. Different authors put a different spin to the plots.

My apologies...I don't know how to post links.

Nancy Drew: Sleuthing blonde haired blue eyed teen, Friends George and Bess, Dad is a Lawyer.

Hardy boys : Three bros, Sleuths, avid comic book readers, different adventures than Nancy's, In some they team up

They may be the same but are extremely different. Try reading the books....