For the first time, Emil is allowed to travel to Berlin alone. His grandmother and his cousin Pony Hütchen are waiting for him at the flower stand in Friedrichstrasse train station. But Emil doesn't show up. While his grandmother and Pony Hütchen are still pondering what to do, Emil has already plunged into an exciting chase. Across the vast, unfamiliar city, always in pursuit of the thief who stole all his money on the train. Fortunately, Emil soon receives support: from Gustav with the horn and his friends.