The journey is exhausting-- little sleep and a lot of physical effort, to say nothing of the psychological strain. The sight of recently-used campsites helps bolster everyone's spirits, but it also sends a wave of uncertainty through Lena. Who were these other people? And why were they exploring? Is there a possibility that they're searching for supplies as well? There's no way of knowing, not yet.

Of course there's an X on a door. And of course they open it because they can't not. Lena gasps sharply, a shiver running down her spine. Her neighbor, it seems, isn't quite as affected. She frowns at him, looking almost disapproving.

"Bit more than that."