In the new case, demolition work in a Berlin arcade colony unearths an acid-filled barrel. When construction workers see human remains in it, Rubin (Meret Becker) and Karow (Mark Waschke) begin to investigate. who is the dead The first lead leads to Saed Merizadi (Husam Chadat), owner of a small dental laboratory in Neukölln. Little by little, the inspectors unearth a tragic family story. You dive into the world of people who live illegally in Berlin. At the same time, Karow continues to investigate on her own. He wants to find out why his former colleague Maihack had to die and finds himself in a dramatic situation.