After the great battle at the Four Oaks, all the cats are deeply shaken. Such a bloody fight must never happen again. Together, the forest and moor cats decide to lift the borders of their camps. Gray Flight finds it hard to believe in a peaceful coexistence with Cloud Sky. The grief for the lost cats is too great. When a devastating illness suddenly breaks out in both camps, the cats are completely helpless. Until they realize that they can only survive if they stick together. When they receive a mysterious message from their warrior ancestors, there is hope: they must grow and spread like the shining star.