She is not invisible

A London teenager who is blind and her younger brother travel to New York to find their missing father, using clues from his notebook. 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 younger brother Benjamin are thrust into a mystery that takes them to New York City. Surviving will take all her skill at spotting the amazing, shocking, and sometimes dangerous connections in a world full of darkness.