"Warrior Cats: The New Prophecy" is the second series in the Warrior Cats book franchise by Erin Hunter. It follows the adventures of four clans of wild cats: ThunderClan, RiverClan, WindClan, and ShadowClan. The story begins with a prophecy that foretells the return of a great danger, prompting a group of young cats to embark on a journey to save their clans. The main characters include Brambleclaw, Squirrelpaw, Tawnypaw, and Crowpaw, who must navigate challenges and uncover secrets about their world. Throughout their quest, they encounter various allies and enemies, ultimately learning about loyalty, bravery, and the importance of unity among the clans.