Firestar's Quest

Warriors: Firestar's Quest (Super Edition)
Firestar's Quest follows Firestar, the leader of ThunderClan, one of the four Clans of cats living in a forest, on a journey to find the lost fifth Clan: SkyClan. After receiving dreams from the previous leader of SkyClan, Firestar and his mate Sandstorm leave ThunderClan to find and rebuild the lost Clan. At the end of the book, the Clan is rebuilt with a leader, medicine cat and territory. It is set in between The Darkest Hour and Midnight.

Though the book was published after Sunset where the point of view changed, Firestar's Quest still uses Firestar's point of view. The book allowed Erin Hunter to explore the old territories again.