Everyone's had a great coincidence happen to them, and Marcus Sedgwick, author of Midwinterblood, White Crow, and the Printz Honor-winning Revolver, is no exception. Some very weird things have happened to the author over the years, a few of which have found their way into She Is Not Invisible, along with an obsession with the number 354, which has 'haunted' him all his life. As a way to finally free himself from this obsession, the number 354 is to be found lurking 'between the lines' of the story, in various ways.