The camping season has started. Platzwart Dieter turns his lap with the lawnmower when he notices an open door on an expensive motorhome. There he discovers a rather unusual interior: the body of electrician Mario Matteses. The sparks also spray in the Schmitz family's house. Hobby craftsman Klaus actually wants to repair a water pipe, but ensures a power failure. Forensic doctor Dr. In the meantime, Krüger discovers evidence of a fall in the Victim: an accident or intention? But the question remains how the craftsman could afford such an expensive motorhome. Neighbor Wolle is supposed to explain this to the investigators and refers to Mario's girlfriend Marie. During the survey, this admits that Mario has given wages and has made many enemies with them. A first hot trail. But also Mitcamper Dieter, who has a criminal record, is suspicious. Because he and Mario had a violent argument!