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<p>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 no one opens the door. What has happened to Mr Bart? Heinrich, with his friend Cristina, don’t think that it is an unplanned trip… LanguageGERMAN LevelA1</p>
