Baby ducklings are about to be hatched on the farm! And when they arrive, they will need to know how to swim. But what happens when one of the ducklings doesn't seem to be cut out to be a swimmer? He'll need to find another way to make his way on the farm, and what better way than to solve mysteries? Food is disappearing, and everyone is sure that the culprit is Oscar the rat. But Hubert, the duck who can't swim, is determined to find out the truth, whether Oscar is a thief or not. He'll need to use his brains, and get help from some of the other farm animals, to solve this mystery and make a new friend.