A Clan in Need — Erin Hunter

Ravenpaw and Barley have been driven away from their farm by a group of vicious cats. Now the two loners must turn to ThunderClan -- led by Ravenpaw's friend Firestar -- for shelter. Firestar takes them in and promises to help them take back their home as soon as possible, but ThunderClan is in great danger. BloodClan cats have been launching raids on ThunderClan's territory and attacking Clan patrols. Can Ravenpaw and Barley help Firestar and his Clan fight off their enemies? And will they ever be able to get home again?