by Franklin W. Dixon
Baker Street Irregulars Square: The Hardy Boys, regressed to high school age, investigate a mystery while their parents are on vacation. With their parents away on a long-overdue vacation, the boys are under the strict rule of Aunt Gertrude. While she approves of their skills and resourcefulness, ...
This is a legitimately good Hardy Boys adventure. There's mystery, suspense, danger (look at the front cover!) and a pretty nifty secret inside the mansion.
I think the Hardy Boy books helped me with learning deductive and inductive skills. I had to work through logic. Who knew? I enjoyed all these books.
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