[olddustytrail]

I haven't seen the movie, but I have read the book a couple of years ago, published in 2016, and I presume you could get the same information from there.

It's not really a secret how a pope is chosen, it's just not something most people are interested enough to look up (there's a missing "in" in that sentence but I couldn't decide where to put it).

Robert Harris wrote the book and also wrote Fatherland, Enigma and Pompeii. Those are three different books but I'd definitely read a book with that single title.