A mysterious trace in Berlin. SLEETER A.

John and Finn are fearless teenagers -detectives from Germany. Exciting adventures await them! This time they fall into the streets of Berlin! Finn and John are involved in the present first children's parliament in the Bundestag. They and fifty more teenage participants will decide what will be built on a small territory near the Reichstag - a playground or a computer “house of games”. But the guys immediately notice that many young “parliamentarians” strangely have new smartphone models. And John and her new friend begin to threaten strange people. It seems that the point here is not just in the "House of Games"...