Warriors is a series of novels published by HarperCollins; it is written by authors Kate Cary, Cherith Baldry, Tui Sutherland, with the plot developed by editor Victoria Holmes, who collectively use the pseudonym Erin Hunter. The series follows the adventures of four Clans of wild cats—ThunderClan, ShadowClan, WindClan, and RiverClan—in their forest and lake homes. SkyClan, the long-forgotten fifth Clan of the forest, is later introduced in the stand-alone novel Firestar's Quest. It receives additional focus in the novel SkyClan's Destiny, the manga trilogy SkyClan and the Stranger, and the 2013 novella Cloudstar's Journey. A few cats in the series are Firestar and Graystripe, though there are quite a few more, such as Bluestar, the leader of ThunderClan, and Brambleclaw.