Yeh I've always thought that. You discover the big bad, you end the big bad, but then they wrap it up saying they found links to other people, case gets brushed away in a sense, end of show.
When I first finished the show I was straight onto Google "who was the cult? what are they? did other people go to those catacombs? was big bad acting under orders or a bit of a rogue extremist?" etc. Just wanted to know more.
Spot on.
They uncovered a whole network of religious based abusers and murderers, with big bad being the blunt force they used to do their dirty work.
I automatically assumed that series two would be the hunt for the powerful people in religion and the money that was running it all.
Maybe if they ever get the two of them back together, this is where they’ll go with it !