One of the episodes in which Matula and Dr. Franck work on opposite sides, but not from the beginning: Matula initially accepts the job, but then he doesn't feel to do the right thing because he's befriended with the counterpart, so he begins to investigate autonomously in opposite direction. This leads to a heavy argument between Matula and Rainer, who even hired another private detective, Klemmer (Peter Zilles) and banned Matula from his practice for a while.