Taking time out of people.
That's why Zoe can't remember past summers.
That's why Justine can't remember her nightmares.
That explains the ghost stories about the White Lady: Josephine in her white dress, floating through the forest year after year. And that even explains why Tom keeps lurking around camp and not really seeming to do anything.
You do the math quickly in your head. Six weeks of camp, one hour per night: 42 hours of time taken away from each person. Plus another few hours at the bonfire. About two days' worth of time taken from each person, per summer.
Lianna's still talking, her voice sympathetically soft and her smile wryly crooked again. "Yeah, I get it. This is a lot to dump on you at once. Are you okay with it all?"
How are you feeling about it? You don't have to tell Lianna how you really feel if you don't want to. But you've got to have some thoughts, right?