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


    The Brains Benton Mysteries


    The Mad Scientists’ Club


    Hope that helps!

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