Rowan and the Zebak (Rowan of Rin)

the long version

After a flying lizard carries off his little sister, Rowan of Rin and three companions are guided by a rhyming riddle on a journey to the land of their old enemy, the Zebak, in order to rescue her. In Rowan's newest adventure, the fourth book in the popular fantasy series, the dreaded Zebak nation closes in on the gentle people of Rin. The Zebak have monsters to carry out their missions, and revenge in their hearts. When Rowan's sister is taken deep into Zebak country, Rowan undertakes a dangerous journey to rescue her. He must save his sister -- and all their people -- from this terrible menace. A fast-paced fantasy adventure!