Premise: Lilly the Witch – The Dragon and the Magic Book (original title "Hexe Lilli: Der Drache und das magische Buch") is a 2009 German children's film directed by Stefan Ruzowitzky. It is a partly animated comic fantasy based on the books by Knister, who co-wrote the screenplay.
Hypothesis: Ruzowitzky wrote the children's book Lilly the Witch.