I saw the film (Apostasy) some time ago which was I thought was rather bleak. Siobhan Finneran was very good, that was its saving grace. It was a glimpse into a different world which lacked colour. The story of the poor girl who died, probably unnecessarily, was so low key it was almost as if it didn't matter. When the film was over I felt as though I'd been in a particularly dreary dream, depressive, and it took a while for me to wake up.
There was another film, 'The Children Act', I watched around the same time about Jehovah's Witnesses with Emma Thompson as a barrister. That was more interesting and dramatic but I think 'Apostasy' probably gave better insight into the Watchtower.
I wonder what Witnesses thought of either film.