I know this is a long shot- but i don’t know where else to turn. There was a children’s book written about a brother and sister who found arrowheads on either the wappoo bridge or the bridge going to folly. As you can tell it was written in the Charleston area. I had checked the book out from the old Charleston Library when visiting with my grandmother one summer- it had to have been in the early 80’s, but I feel like the story took place in the 50’s (not sure), but I loved the book. I just wish i could remember its name. If anyone can help i would be extremely thankful.