In The Invisible Kingdom: Reimagining Chronic Illness, the poet and critic Meghan O’Rourke takes the lonely journey of life as a sick person as her book’s subject. But O’Rourke is not content with simply explaining what it’s like to be ill, though she does that very well. Instead, she deftly weaves scientific explanations of autoimmune illnesses and the broader problems of American medicine into a personal narrative of her search for answers.