Erin Hunter is a collective pseudonym used by three authors, Kate Cary, Cherith Baldry, and Victoria Holmes, who write the popular children's book series, Warriors. The series is about a group of wild cats living in four Clans: ThunderClan, ShadowClan, WindClan, and RiverClan. The books follow the adventures and struggles of various cat characters, with themes of loyalty, honor, and the balance of nature.