As a child, Alethea Black drifts between her father, a brilliant mathematician who is also her best friend, and her mother, a frank and outspoken woman on fire. After her father’s death, Alethea is left unmoored, a young woman more connected to life’s ethereal mysteries than to practical things such as doing laundry or paying taxes. And then, just when life seems to be getting back on track, she’s suddenly racked by crushing fatigue, inexplicable pain, and memory loss. With her grasp on reality fading, and specialist after specialist declaring nothing is wrong, Alethea turns to her own research and desperate home remedies. But even as her frantic quest for wellness seems to lead to confusion and despair, she discovers more about her own strength than she ever could have imagined—and becomes a woman on fire herself.