Main Characters Detective Nadine Keller 3 main appearances Detective Karl Schulz 3 main appearances Antje Borchert 3 main appearances Martin Ludwig 3 main appearances Stefan Proska 3 main appearances Jochen Müller 1 main appearances Yilmaz Yussef 1 main appearances Steffen Marquardt 1 main appearances Claudia Hartmann 1 main appearances