Sally, of the Brigantes tribe, is renowned for her miraculous healing skills. At the same time, she is feared and misunderstood and accused of witchcraft. When she becomes ill with Plague then manages to cure herself, she is forced to flee from their madness.
During a storm, she meets Tom, of the Pictii tribe, who helps her to survive. Sally does not know it yet, but although she has recovered and is now immune to the disease, she has become a carrier of the plague. By the time she realizes it, Tom is infected. She puts the completion her intended journey on hold and distills a cure...