Long winter evenings are when Jolly Street is at its most beautiful. Bright lights shine from homes and trees flicker, filling the air with the spirit of Christmas, brightening the happy faces of snowmen. At Christmas, Mary the cat loves nothing more than to visit her grandmother, even though she lives in an old house that doesn’t always have hot water running from the tap. The adventure starts with a terrible event: Captain Cash abducts Santa Claus and takes him to a hidden land. Will Mary and her friend Louis succeed in saving Christmas?