Storms have destroyed the world. Radiation wreaked havoc with survivors causing everyone except pregnant women and animals to perish. Now a group of mutant teens, horses, and a neurotic dog must go on a journey to save their people. They live life in a protected valley, but will not live long if they cannot find a cure for the sickness that is killing them. Along the way they will meet animals they've only seen in books, make new friends, and learn the truth about a secret one of them has been keeping.