Mountain cats have finally reached the desired lands, where there is plenty of prey, where nothing threatens them and where they can fully demonstrate their abilities. But tensions between the divided settlers are growing. Clear Sky strictly controls its forest territories, not allowing either former friends or local loners to hunt them. His brother Gray Wing, who lives in the wastelands, is against such orders; he is sure that all cats should live together and help each other. The young cat Thunder, the son of Clear Sky and the pupil of Gray Wing, finds himself at the center of a struggle for power, influence and territory. He has to make a difficult choice between the principles of life of his father and uncle.