For a long time, a little ghost had been living in the attic of a castle. Its greatest wish was to see the world by the light of day, but its attempts were all in vain. But then, three children, Karl, Hannes and Marie, go on a night time hike to the castle where they encounter the little ghost. The following day, the little ghost promptly wakes up at noon.  Tinted black by the first sunbeam, the little ghost scares the townsfolk and causes all kinds of chaos. In despair, the little ghost turns to the children for help in trying to get home and return to the former existence as a night ghost.