most peoples first question is, is it a real currency.

best proof i gave was ordering pizza with bitcoin. when it arrived we then chatted about bitcoin. by the time we were finished then they were ready to learn about the technicals of it

throwing them in the deep end about the technicals first will just bore them and have them asking questions about is it actually useful in the real works and should they even bother reading something about something they have not yet used, seen or dealt with.

maybe look into local merchants/retailers that accept bitcoin. and along with the book send them invitation to make a btc address and you will send them enough for a coffee, pizza, doughnut or cake at the local store to buy.