"There's stuff in this play that wasn't reported to the press at the time," confesses playwright David Burton, "There's a few surprises for people."
"I came in to the process thinking I was writing a David and Goliath standard, very 'rough and tumble spiritual underdogs' against a 'big bad empire'," says Burton, "But what was underneath it was a congregation which was of course very complex with a lot of human stories underneath it and a huge range of different experiences."
"So the play's breadth is quite wide. We talk about theology; we talk about looking for spiritual significance and meaning; and we talk about how our institutions operate in the 21st century and what contemporary religious organisations should look and feel like and how they should prioritise; and I ended up really really striving to make sure the play didn't answer any of those questions."
"When I first came to the script I was like, 'Hmm will I understand this?'" says Klarwein, "But I completely understand it."
"It's kind of a thriller in some ways because you sort of try to work out what's going to happen next. Even if you kind of know the story, you're kind of going, 'Hmmm how's that going to go down?'"
That's because you don't have to be religious in order to appreciate St Mary's in Exile. The play doesn't take sides, and instead serves to simply tell the truth of the tale without demonising the church or Father Kennedy.
"A lot of it is verbatim," Peter Marshall says of the dialogue in the script, "So Peter Kennedy's words are coming out of my mouth."
"It's a play that poses a lot of questions from all sides," says Burton, "It's a play that doesn't take sides."
"I hope it's very universal – that people can come to the play and each get something out of it and go home asking some interesting questions and having some interesting discussions. Plus, I just think it's huge. It was a schism that happened in the Catholic Church, which depending on how you look at it hasn't really happened at this level since the eleventh century and it happened just up the road. It was a tremendous event of international significance and it's been really wonderful to write about it and to get great responses so far and to get to work with this amazing group of people."
St Mary's in Exile is playing until 25th September, so book yourself a pew now.