The Great Battle ended peacefully, but the roots of the Four Trees are soaked in blood, and almost everyone in the valley lost family and friends in the brutal battle. Sorrow and fear settled in the hearts of the cats. They swore to the star ancestors to live in peace, but keeping this promise is not so easy. Gray Wing, broken by the illness and death of Turtle Tail, cedes power to Thunder, and Clear Sky is expelled from the camp by a ruthless invader who came from the wasteland. To top off all the disasters, a mysterious disease appears out of nowhere, claiming the lives of those who survived the battle. To survive and win, the cats must find the mysterious Sparkling Star, but the path to the solution will not be easy. Betrayal, which has sunk its claws deep into the heart of the forest and wasteland, leads their inhabitants into a disastrous trap...