Wings that whistle, Legs that fly... So begins the mysterious invitation that Cowlick and his sisters Rachel and Roisin get from their Uncle Pakie, asking them to come to the local river. But when they get there, with their friends, Tapser and Prince, Uncle Pakie has disappeared - leaving behind another mysterious poem. With their cousin Jamesie in tow, they set out in a horse-drawn caravan to explore the countryside and find the missing Pakie. All they have to guide them are the clues they find in his cryptic poem.