Rowan and the Zebak (Rowan of Rin, 4)

When a flying monster kidnaps Rowan's little sister, Annad, Rowan fears the warlike Zebak people have attacked his village of Rin. And Annad's capture is only the beginning.Now Rowan and his companions must make the treacherous journey into Zebak territory, fighting the monsters that guard its city and the enemy people within it. If they fail, Annad will be lost -- and so will all hope for the survival of Rin.