I almost remember that book. I do remember the name. Nancy Drew may have gotten me started on mysteries, exploration, etc. Also, the public library.
Going into the new library door, decades later, where I hit my head on the glass door, shown around by childhood friend, we crossed the street and then the murders began.
I miss the old library; we left Evanston in the mid fifties, so, other libraries, other places, but it was weird to see this glassy new place on my later visit, never mind the head and glass banging.