We got informed by a couple people that the end sequence was badly borked; we JUST pushed a hotfix. Redownload the game and try now?
But you can't beat the game with just the knife, the journal, and the play--if you have only those three items, it won't warn you that you need more evidence, but you get stuck at the "what happened after the mutiny started" stage and none of those three items will get you past there. That's a softlock state.