The Sister of the South (Deltora Quest 3)

With the aid of Deltora's last dragons, Lief, Barda and Jasmine have destroyed three of the Four Sisters, evil Shadow Lord creations that are poisoning the land. Their quest will end in the city of Del, where the Sister of the South lies hidden. Del is the companions' home, but it has changed. Fear now stalks the streets, treachery lurks behind smiling faces and evil prowls the palace. Burdened by a terrible sense of foreboding, Lief knows that every step he takes leads closer to disaster. Yet he cannot stop, he cannot turn back. And in the Shadowlands the Enemy gloats, waiting for the terrifying end.