According to her mother, Amanda, Cindy was interested in spies and codes at a young age. Mark bought her Orrin Oscar Lutwidge's A Child's Garden of Cyphers. Later Cindy presumably used this code to leave the markings on the outside of the Lunchbox Puzzle. The contents of the box are of Cindy’s handiwork, according to Mark. Cindy's voice is also recorded at the end of the “Rise, Rapture, Rise” record that appeared in Mark's office. Judging by the characteristic metallic echo in her voice during the recording, it is very probable that Cindy has already been turned into a Little Sister.