Conversation so far:
who said everyone is equal but some are more equal than others
Everyone is equal but some are more equal than others is from George Orwell's Animal Farm.
what was george orwell's first book
Down and Out in Paris and London is the first full-length work by the English author George Orwell.

Question: what was the author's most recent book
Self-contained rewrite: what was george orwell's most recent book