The Grizzled
If the last card played empties the piles but also fails the mission, do you win?
The rulebook returns failed cards to the Trials pile, so the pile is not empty, and several posters report the same answer.
No. The failure resolves first: the No Man's Land cards are shuffled back into the Trials pile, so that pile is no longer empty and you do not win. The only exception is a failure that leaves No Man's Land empty (for example a Hard Knock), which returns no cards.