Erin Hunter 
Survivors: The Gathering Darkness #6: The Final Battle 

The time has come for a traitor to fall. Dont miss the action-packed final adventure in the Survivors: The Gathering Darkness series!From Erin Hunter, #1 nationally bestselling author of Warriors, Survivors is full of wild and wonderful adventure (Kirkus; starred review) that will thrill fans of Spirit Animals and Wings of Fire.Storm has discovered the identity of the traitor dog who was sabotaging her former Packbut when she returned from her exile, she fell right into the Bad Dogs waiting trap.Now a prisoner in the Wild Packs camp, Storm is running out of time. This is her last chance to save the Packand to put an end to what the traitor began.