Marcus Sedgwick, author of Midwinterblood, White Crow, and the Printz Honor-winning Revolver, has experienced a wonderful coincidence. Over the years, the author has experienced several strange events, some of which have made their way into She Is Not Invisible, as well as a lifelong preoccupation with the number 354, which has 'haunted' him. The number 354 can be discovered lurking 'between the lines' of the novel in many ways as a method to eventually release himself from this obsession.