"In 2012, Vanessa Potter, a married advertising film producer with two young children, was stricken by Neuromyelitis Optica Spectrum Disorder (NMOSD), a rare illness that resulted in sudden blindness and paralysis. She was hospitalized for two weeks. Over the next five months at home, she regained mobility but recovering her sight was more problematic. At first what she saw was monochromatic. As color reappeared, she encountered synesthesia (experiencing odd responses to stimuli, such as hearing inanimate objects talk to her). While a multidisciplinary team of neurobiologists, psychologists, immunologists, and developmental biologists treated her, she blogged and kept audio-diaries, using the pen-name Patient H69. In her own words, Potter reveals the terror and torment of her blindness. Supported by neuroscientists and Britain's National Health Service, Potter became a science sleuth, uncovering some of the innermost functions of the brain and our complex visual system, while learning