Since the ShadowClan has broken away from the StarClan under the leadership of the mysterious Sol, the order of the four clans is at risk of collapsing. How are Jaypaw, Brambleclaw, and Lionpaw supposed to convince the forest cats that their ancestors are still watching over them and that the warrior code is vital for all of them? But suddenly, a terrible accident occurs in ThunderClan that turns the siblings' lives completely upside down...