A prophecy foretells that three ThunderClan cats will hold the power of the stars in their paws, but although Jayfeather and Lionblaze know that they are two of the cats in the prophecy, they must determine who the third cat is.

Despite the peace of the forest, strange visions drive a young WindClan cat named Moth Flight to leave her home on a journey that will change the future of the new warrior Clans forever.

"After countless moons of treachery, Tigerstar's Dark Forest apprentices are ready to lay siege upon the warrior Clans. As Jayfeather, Dovewing, and Lionblaze prepare to lead their Clanmates into battle, they await the arrival of the mysterious fourth warrior who is prophesied to help lead the Clans to glory."

When an ousider appears in the ThunderClan's midst, it drives the Clans further apart and as tension mounts they must decide who they can trust before it is too late.