Sally, of the Brigantes tribe, is a renowned healer. 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. Unknowingly, she has become a carrier of the plague. Now her services are sorely needed at the court of the High King at Tara, in the hopes that she will be able to cure him.