In 1985, twelve-year-old Paul is living in East Berlin, with his Grandmother Liese and his Uncle Henri. His parents were caught fleeing to the West and sent to prison, while Paul had to stay in a children’s home until his grandmother managed to rescue him. He makes friends with the new girl in class, Millie.
When Paul and Millie visit the Pergamon Museum, clearly things are suspicious! Following the clues, the two friends find out that Uncle Henri is secretly helping the shady professor Hartwig to find the Hieroglyphic Stone, which is said to be hidden somewhere in the museum.
But why is the Stasi bugging Oma Liese’s apartment? And is Millie also lying to him? Paul and Millie start open up to each other and solve the puzzle with esprit and ingenuity. Will Paul eventually be reunited with his parents?