Lilli must cope with her younger brother Leon. He’s allergic to animals, so she isn’t allowed to have a rabbit and, even worse, he breaks her new telescope. She discusses the situation with her little green (animated) dragon, Hector. Contrary to his advice, she applies her own magical talents to search through the Middle Ages and bring Knecht Ruprecht into the present. Yes, Ruprecht can set Leon right, but he also meddles in the lives of others, including Lilli’s teacher, Frau Schnabel. His actions send Lilli back to the Middle Ages to find Nicholas – the only one who can save the Christmas holidays from a catastrophe.