The book was Hohlbein's first success as a writer and the starting point of his career as one of Europe's most well-known and prolific fantasy writers. It was published in over a dozen countries and sold more than 2 million copies, and became the first Hohlbein novel released in the English-speaking world in 2006.
The novel tells the story of the land that people travel to when they dream, and how a young boy finds courage and strength in fighting, but also in accepting, his own deepest fears and nightmares.
Kim is an average German schoolboy who hates math but loves to read the latest copy of Star Fighter. His daydreaming life spirals into a nightmare when his parents inform him that his little sister Rebecca has fallen into a mysterious coma after her appendicectomy. A visitor from the realm of Magic Moon, the wizard Themistocles, tells him there is only one way to free her from the enchantment of eternal sleep: Kim himself must travel into the land of dreams and save her from the dark wizard Boraas, who has captured her soul.
So his next dream pulls Kim into Magic Moon, where he must fly a spaceship, disguise himself as a dark warrior, fight dangerous monsters and fantastical creatures, and journey ever-onward through forests and mountains to the end of the world, only to find out that the answer to saving Rebecca – and Magic Moon – lies within himself.
The story of Kim's adventures in Magic Moon was continued in a second novel, Märchenmonds Kinder ("Children of Magic Moon") in 1990 and a third one, Märchenmonds Erben ("Magic Moon's Heirs") in 1998.
A further installment, Die Zauberin von Märchenmond ("The Sorceress Of Magic Moon"), released in Germany in 2006, features a girl called Rebekka as the new protagonist. She is, however, not Kim's sister, although it is strongly hinted that she is Kim's daughter, as it is told that her father used to tell her stories about Magic Moon.
The newest installment is Silberhorn ("Silverhorn"), released in Germany in 2009, features another main-person in a more earth-bond-setting.