During the wintertime, life is not easy for Nina the homeless cat. She lives in the middle of a big city in a house made of cardboard. When it gets cold, Nina puts on her warm woolly red sweater. But one day when she's out for a walk, the sweater starts unraveling. Without her sweater, the windy winter weather is unbearably hard! Nina follows the yarn as it winds through alleys, up walls, and over rooftops and towers. Luckily for her, this race ends in an unexpected place, where Nina receives her first Christmas present.