Graded readers are books for language learners, either a selection of short stories or a novel. They are written with a limited grammatical and lexical complexity and avoid too many different characters and a plot which consists of multiple layers. 

Graded readers may be adaptions of well-known books or completely new stories. Learning German through stories is one of the most enjoyable and efficient ways of improving your German skills. Language students who read a lot also write and understand better than those who just work with textbooks. You’ll pick up new vocabulary without even noticing it and quickly boost your language skills.