[The first picture Nico finds is of himself and his older sister. It looks like it was taken at the military academy. There's a wariness in her posture, the kind of look she wore often before they were whisked away to Camp Half-Blood. She's only twelve, which makes the smiling version of himself about ten.
His heart breaks a little, looking at it, but he's glad to have it. He's afraid he'll forget her face one day, like he had their mother.
Eventually, he'll pocket the image and go searching for more.]