Achmed's girlfriend Carlotta turns to Commissioner Heldt: Her car was stolen during car sharing. At first Heldt thinks she found the missing Melanie Brahms in the thief. The disappointment of Melanie's mother Judith is great when she learns that Melanie was not sitting in the car. The car thief is underage Lucy Kolenda, who could only start the car with an app from Melanie's cell phone. Where is the 18-year-old?
