Mapleshade's Vengeance — Erin Hunter

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.