Starlight is the fourth book in the second series of Warriors, called Warriors: The New Prophecy. The book is told from three different points of view: Leafpool and Squirrelflight, two sisters, and Squirrelflight's love interest, Brambleclaw.
This book takes place in a forest around a fictional lake. The forest is populated by groups of feral cats, who live in groups that call themselves Clans. The four Clans are ThunderClan, ShadowClan, WindClan, and RiverClan. The cats usually train to become warriors, who hunt and fight for their Clans.