Heretic opens with two young Mormon missionaries talking about penises on a park bench. The light hearted opening is in stark contrast to the tension to come and serves as a fun introduction to two endearing characters. Sister Paxton (Chloe East) has been born and raised in the church, eager and enthusiastic she is desperate to land her first conversion. Sophie Thatcher's Sister Barnes is more experienced and more comfortable in the world at large. We spend some time getting to know them as they make their rounds, hearing about their hopes for a handsome husband and sadness at the way they shunned and considered "weird" by their peers. We are thoroughly on board with them by the time they encounter Hugh Grant's seemingly gregarious Mr Reed. He appears interested in their beliefs and impresses the girls with his religious knowledge but the conversation becomes more testy and they realise they can't leave Reed's house without playing his game. To say Hugh Gran