Nico had run away... again.

He's not sure why they still come looking for him. It's not like he's been very kind to any other kids at camp, even the ones who called themselves his friends. He kicks a rock, and is drawn out of his thoughts when it rolls back in front of him. Nico looks up.

A kid, around his age, sitting on the curb. Nico realizes now that he isn't even sure exactly where he's ended up, but any worries about that fade as he realized something off about this person: their image is flickering, fading in and out like a dying lightbulb.

Or a ghost.