Flibberty is a young otter who spends his nights dreaming and staring at the moon instead of catching fish. But one day, the King of the River sets him a seemingly impossible task: to serve him a great fish on a silver dish before daybreak. As the moon rises over the river, Flibberty sets off downstream on a journey that will take him far from home. But will he manage to fulfil the king's wishes before dawn?