Laureth Peak's father has taught her to look for recurring events, patterns, and numbers--a skill at which she's remarkably talented. Her secret: She is blind. But when her father goes missing, Laureth and her 7-year-old brother Benjamin are thrust into a mystery that takes them to New York City where surviving will take all her skill at spotting the amazing, shocking, and sometimes dangerous connections in a world full of darkness. She Is Not Invisible is an intricate puzzle of a novel that sheds a light on the delicate ties that bind people to each other.

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 this book, 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.