I had a reasonably major character who was waiting someplace for some other characters to arrive, and she was reading a book to pass the time. Then I decided to go for it. Not only am I going to actually say which book it is, it’s going to be Pride and Prejudice.
Not only is she going to like the book, I think she’s going to talk about it with the brothers.
For some odd reason, this feels almost transgressive. I don’t know why; there’s no rule against having a character read a good book. In fact, there are plenty of instances in golden age mysteries of characters talking about other fictional detectives. There’s no reason I can’t have the characters talk about an interesting subject on occasion.