Thirteen-year-old Sophia Tims, with her friend Theo, continues to search for her parents, explorers who have vanished as the borders shift within a world transformed by the Great Disruption of 1799.

ThunderClan's darkest hour is upon them and Fireheart, the warrior cat, must protect his clan from a threat unlike any the forest has ever seen, as the time comes for prophecies to unfold and heroes to rise. ThunderClan's darkest hour is upon them, as Tigerstar's quest for power plunges all the Clans into the most terrible danger any cat has ever faced. In order to save his Clan and his friends, Fireheart must uncover the meaning of an ominous proclamation...

Fireheart, the warrior cat, faces many challenges in his new role of ThunderClan deputy as his apprentice, Cloudpaw, resists following the warrior code, Bluestar weakens, and Tigerclaw continues to haunt the forest seeking revenge.

"Brambleclaw, a warrior of ThunderClan, has received an ominous new prophecy from StarClan that speaks of a mysterious danger. Now he will need the courage of the greatest warriors to save the clans" -- Page 4 of cover.

Rusty, a bored house kitten, is apprenticed by the ThunderClan and must struggle to fit in when the group of feral cats is threatened by ShadowClan, the enemy.