The end of the stars draws near. Three must become four to battle the darkness that lasts forever...

After countless moons of treachery, Tigerstar's Dark Forest apprentices are ready to lay seige upon the warrior Clans. As the Clan cats seek out their allies and enemies, Jayfeather, Lionblaze, and Dovewing search desperately for the fourth cat who is prophesied to help them lead the Clans to victory-and who may be their only hope of survival.