This is a sort of off shoot of Who Do You Think You Are. And I think the format, ie the way the show is put together, has become a bit tired and predictable.
But of course the stories, real life facts, do overcome that.
So devastating to watch, and hard to believe that so many people could have taken part in what was almost an industrial approach to mass slaughter.
Episode 1 has already been broad cast and the second episode is next monday www.bbc.co.uk/programmes/m000pbwk