 Heinz Rühmann and Gert Fröbe both starred in the 1958 movie.The three films follow the same basic plot, where a senior police detective is detached to investigate the murder of a little girl.As the detective hopes for leads while talking with the mother of the murdered girl, he pledges to find her killer – and so, even after leaving the police force, he embarks upon buying a gasoline shop in the remote area where he hopes to find the criminal, and uses a little girl as bait to attract the killer.