Erin Hunter 
Warriors: The New Prophecy #5: Twilight 

Erin Hunters #1 nationally bestselling Warriors series continues with the fifth book in the New Prophecy series!The fifth book in this second series, Warriors: The New Prophecy #5: Twilight, brings more adventure, intrigue, and thrilling battles to the epic world of the warrior Clans.New territory brings new troubles for the fierce cats of the warrior Clans, and former allies are acting strangely hostile.As divisions between the Clans grow deeper, Firestars daughters face troubling decisions. The choices they make now could affect Thunder Clan for generations to comeand with an unexpected enemy preparing to attack, their courage and strength will be needed more than ever if the Clan is to survive.