My headline comment for this would be ... true crime fans only. I am one such person and knew a bit about this case and so was interested enough to watch. One thing to make clear is that this is not an in-depth coverage of the case from start to finish, it comes in at a point in the relatively recent past when a lead appears and it follows the pursuing of that lead. It starts off slowly but gathers pace and the alleged perpetrator involved is a disturbingly compelling character who appears throughout.
Without knowing the outcome, it becomes gripping. If you happen to know up to date details of the case then I suppose it's like knowing the ending to a film. Nonetheless, the commitment of the father to discover the truth about his daughter, having long established she must be dead, is both painful and admirable to watch. Watching a man going through hell, being given hope but always with the possibility that hope evaporates to nothing, is at times excruciating. I'm so sorry for him.
All good-natured true crime fans will be entertained at this, whilst thanking God they are only spectators.