HTS was a special book for me. It got me writing more than actually spying, because (a) spying is a lot of work, and (b) I’m most interested in myself anyway. I have kept a journal pretty much since then (I’m …going to guess age 9 or 10). Found the sequel disappointing.
A couple years after I read HTS, I noticed a younger friend acting strangely and in possession of a notebook. A bit annoyed because after all that was my thing, said in my most superior voice “Oh, you’re in THAT phase …”