A friend has a question and it's beyond my expertise to answer. We're trying to identify an episode of Hawaii Five-O and all he remembers about it is that it involves a serial killer murdering women all over The Island. There's no explanation as to how he gains entrance to their homes and no seeming connection between his victims until McGarrett (or someone) figures out that all but one had their cars washed at a certain car wash. The killer worked there, picked his targets and secretly duplicated their house keys while their autos (with the keys in them) were going through the car wash.
The reason my friend needs to know about this episode is boring and would be of no interest to anyone. But he needs to, and we're hoping someone reading this is enough of a Five-O buff to tell us which one it was.