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Heinrich has been studying in the city for a year but every weekend he goes back to his parents' house in the country. He especially likes going to see his old friend Mr Bart, a retired chemist. One Saturday morning, Heinrich knocks on his door as usual but this time nobody opens the door. What has happened to Mr Bart? Heinrich and his friend Cristina don't think this is a planned trip.
A collection of short readers (not full text) enriched by colour illustrations, notes on vocabulary and interspersed with a variety of comprehension activities and exercises. The accompanying audio material offers a reading of the entire story as well as some listening exercises, as detailed in the books. With different graded levels, the series offers a progressive approach to learning German, particularly in building up a wider vocabulary and understanding of sentence structures. Each reader also includes short articles on themes and items of interest relevant to the story (history, literature, tourism, nature...) which help to develop a greater understanding of German culture and civilisation.