It Happened in Broad Daylight.

Several young girls were killed in a rural area. Thus Inspector Matthaei has to travel to the region where it happened and has to search for the killer. When all the people suspect a roamer to be the killer he gets lynched and everybody thinks that the crimes will stop now but not Matthaei who searches for a blond girl that looks just like the ones that were murdered. He finds one and stays with her and her mother, attracting the murderer with the girl trying to catch him this way.