Warriors: Mapleshade's Vengeance

In this novella from the world of Erin Hunter's #1 nationally bestselling Warriors series, discover the sinister past of one of the most treacherous cats in the Dark Forest, leading up to the events of Warriors Super Edition: Crookedstar’s Promise.
Long before she troubled the dreams of Crookedstar or Tigerclaw, Mapleshade was a warrior of ThunderClan. But then the Clans cast her out as a traitor—and she vowed to seek her revenge….
Warriors: Mapleshade's Vengeance also includes a teaser to Warriors Super Edition: Crookedstar's Promise.