328H: Newspaper Boy Has Genius Inventor Friend

Seeking 1970s YA mystery. Protagonist delivers newspapers and in a subscription sales contest. Has a genius inventor friend (including retractable staircase). Mysterious house with strange noises. Turns out to be a family of circus performers who buy a lot of newspaper subscriptions.

One thought on “328H: Newspaper Boy Has Genius Inventor Friend

  1. I’m not completely sure, although it sounds like it might be part of certain boys’ mystery series from around that time or in the 1960s, like:

    The Marvelous Inventions of Alvin Fernald

    https://www.goodreads.com/book/show/1039249.The_Marvelous_Inventions_of_Alvin_Fernald

    The Brains Benton Mysteries

    https://www.goodreads.com/book/show/2311878.The_Case_of_the_Missing_Message

    The Mad Scientists’ Club

    https://www.goodreads.com/book/show/222127.The_Mad_Scientists_Club

    Hope that helps!

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