Prince Elwin is summoned to Wind City by his friend Lady Skylene. The request comes in the form of Duuk Vanger of the trail riders association, riding on a strange beast called an Ack-dar. Duuk has brought three extra animals to carry Elwin and Filo the Fixer and Buddie the Wortdog. At the first campsite known as Robber's Roost, they are confronted by the aged but famous robber Baron Hardscrabble and his companion Bodkin. In a short skirmish, the Baron is defeated when one of the Ack-dars lifts him off the ground and turns him upside down. The Baron promises to reform and the party travels on. They arrive at Wind City, where Skylene tells Elwin that at certain cycles of the moon, on very dark nights, the water supply for the city disappears. This is very dangerous, as the water is needed in the production of pottery that the citizen's of Wind City trade for other goods. Buddie the Wortdog, while prowling one dark night discovers that the water is being consumed by a giant bat-like creature called a "Raptor Bat". Filo the fixer designs and the citizen's of Wind City construct a large tower with a light source. The Raptor Bat returns during a celebration, and Elwin, Duuk and Skylene protect the citizens during the first attack. As the flying creature returns to attack, Buddie the wortdog turns on the light and scares the large bat away. The entire population is happy and safe. Filo and Buddie return to Squatland with the help of Baron Hardscabble, and Elwin with his two new friends travel to the Castle of Gallamaufry, where Elwin thinks a maiden is being held in the tower.