Warriors The Broken Code Lost Stars Book.

For the first time in history, the five warrior Clans have found true sanctuary in the land surrounding the lake. When the forest is hit by a brutally harsh leaf-bare season, a new darkness emerges, threatening a beloved Clan leader, the cats' link to their StarClan ancestors, and the very warrior code they live by.

The opening of this sixth Warriors series is full of action and mystery, making it the ideal introduction for newcomers to the Warriors universe.  Long-time fans will be excited to learn of the new adventures that unfold following the events of A Vision of Shadows.