But the answer is I just don't know.
The problem with this case is the number of individuals who look promising one way or another. You can find info about them here, too.
There are enough red flags about Frank Dienes that he should be seriously looked at. And questioned.
But there is no doubt in my mind that Joe Kopp told people Frank was involved in the girl's abduction. That alone makes Frank interesting.
But, like everyone else, I'm still waiting for that missing piece.