There is peace at last between the warrior Clans, and all four are thriving. Then Firestar, legendary leader of ThunderClan, discovers a shocking secret: StarClan, the warrior ancestors who guide his paw steps, have lied to him.

Firestar must embark on a perilous quest to discover a long-forgotten truth. Whatever he finds at the end of his journey, he's sure of one thing: Nothing will ever be the same again.