Thanks for an interesting post, Nola. I was about to add Gilead by Marilynne Robinson ( it is a letter from an aging minister to his young son - yes, the whole novel, I think). But have remembered that the minister often lapses into the first person with comments like 'I've wandered from the point again because I saw your mother . . .'. So I guess it is a mix but intentionally second person. I didn't find it gimmicky or difficult but I don't expect ever to try writing it at any length.