Ein Fall für zwei is a German television series, which premiered on September 11, 1981 on ZDF. The series, located in Frankfurt am Main, features two main characters who solve crimes: a defense attorney and a private investigator. Josef Matula, a former German police officer, has gone into private business. His method of investigation is very effective and direct, and he sometimes even resorts to dirty tricks. Claus Theo Gärtner has portrayed the role since the start of the series. In contrast, the attorney character has changed several times. The first attorney was Dr. Dieter Renz. Dr. Renz retired in episode #60 and was replaced by Dr. Rainer Franck. In episode #149, Dr. Franck took a job as a law school teacher, and was replaced by Dr. Johannes Voss. In episode #182, Dr. Voss was shot dead by an escaping criminal, and was in turn replaced by Dr. Markus Lessing. Most of the episodes follow a simple pattern. Someone is murdered, and the police arrest the most likely suspect. The suspect, claiming to be innocent, hires the attorney in the series as his lawyer. The attorney does all the paperwork, talks with the police and attends court. Meanwhile, Matula does all the actual research and detective work - "gets his hands dirty", so to speak. Matula often gets into fights, and even though he is in his early sixties, he often knocks out the bad guys. In the end, the original suspect usually turns out to be innocent after all, and the real culprit is found.