Turns out that one or more of you might not actually be interested in leaving.
Yes, you have a traitor in your midst, someone who is trying to thwart the team from exiting — but if they get called out during the game, then someone else gets to claim their action and take charge of it, so they'll need to be sneaky in order to keep the clock running and let the team fail. Hidden Roles also includes challenge cards that players might acquire before or during play: visit this location, claim that object. Can you make others help you achieve your hidden goal?

Note from publisher: These expansions don't work with fewer than 3 players.