On an Earth scarred by nuclear war, Snake harnesses the power of venom to cure illnesses and vaccinate against disease. The healer can even ease patients into death with the power of her dreamsnake. But she is not respected and trusted by all, and when she tries to help a sick nomad child, the frightened clan kills her dreamsnake.

Ashamed of being misjudged and grieving the loss of her dreamsnake, Snake has one choice to maintain her livelihood: she must travel to the city, which jealously guards its knowledge. And before she faces the prejudices and arrogance of the people there, Snake must make her way across a barren desert, surviving storms and radiation poisoning, helping those she can—all while a madman stalks her every move . . .