The time has come for three kits of ThunderClan--Hollypaw, Jaypaw, and Lionpaw--to become apprentices. Grandchildren of the great leader Firestar, all three possess unusual power and talent. But dark secrets surround them, and a mysterious prophecy hints at trouble to come.

While Jaypaw, Hollypaw, and Lionpaw struggle to understand their powers as warriors, the cats' faith in StarClan is tested yet again.

As doubt rocks the forest, Hollyleaf, Lionblaze, and Jaypaw are determined to convince the warrior Clans that faith in StarClan and the warrior code is more important than ever. At the same time, vicious rage lurks in the most unexpected places, and one cat will reveal a breathtaking secret...

A Leoncillo, Carrasquina y Glayito, tres de los gatos del Clan del Trueno, les ha llegado la hora de convertirse en aprendices de guerreros. Los tres cachorros han demostrado tener la astucia y la fuerza requeridas, y todo apunta a que se convertiran en protectores destacados de su grupo. Pero Leoncillo, Carrasquina y Glayito se veran envueltos en un oscuro secreto, y una antigua profecia augura la llegada de dias dificiles, en los que aumentaran...