I must say, I'm disappointed by the poor showing Three Investigators is making in this poll. I was obsessed. As were my classmates - we even set aside a cubby where we put all of our copies so that we could borrow each others' books, because no one had the whole series.

Oh, there was the Anne of Green Gables, obviously, and because I was a good Jew, the All of a Kind Family series.

Oh, not a series, but if the theme is kids' detective books - Harriet the Spy. She was awesome.