This was fantastic! There were some really cool "aha!" moments throughout the game where a new piece of information recontextualized older documents and I would get a few more names checked off.
I ended the game with 49/50 documents discovered (and the one I hadn't discovered was just information I already knew about the Stalwart, I found it with document count enabled) and I figured out who was the heir before filling in the rest of the family tree.
Lovely presentation style, very polished and well written, great game!