A series of post apocalyptic books beginnin where the world has changed; man no longer reigns supreme, but is hunted by mutated versions of humans, destroyed by virus and bacterial infection and by monstrous animals, rabbits have teeth and bite. The heroine battles through, initially believing that she and her sister are the only people left. Imagine her surprise when she meets new people. After a disaster they band together and look for a place of safety. The four books chart their journey and their adventures. The books are well written and enjoyable.