As soon as whoever it is — usually, a child or grandchild of some older person shows up clutching a proxy in hand, evil will be done. The old person will be forced out of his home, all his possessions will be stolen right down to and including his most comfortable chair.
Soon, a scream will echo through the halls of the lordly manor as the corpse is discovered.
Will it be the old person or the young person … or, sometimes, someone apparently completely disconnected from the event? Barnaby and his sidekick Ben will investigate.
The truth will always surface and that person found dead — who I assure you will not be the only person found dead because no good Midsomer Murder has fewer than three murders in any episode — will ultimately be discovered to have some hidden, furtive relationship with everyone else.
Who is everyone else? Family, of course. And the wealthier and nobler the family, the more murders will have occurred before the show ends.
I always feel short-shrifted if there are fewer than three murders in an episode. And there has to be at least one scream.