Each night, like every other child in the world, Miko goes to Dreamland thanks to magic sand dispersed by the Sandman. But one night, the evil dream Habumar steals the Sand of Dreams and takes control of Dreamland. The Sandman and his faithful sheep Neopomuk ask Miko to help them get back the precious sand, and to hence foil the plans of terrifying Habumar. So begins a great adventure in a world where all is possible.

They are actually a mother-daughter team that could hardly be more harmonious: the respected Hamburg pediatrician Claudia Kayser and her almost 17-year-old daughter Carolin. Since the tragic death of her beloved father, the two have become even closer - at that time the girl helped her grieving mother to overcome a difficult emotional depression.