David competes with a rival when a position of authority in the church opens up. Meanwhile, his 17-year-old daughter Rachel preaches the word of God around the city, until an encounter with a handsome boy changes her whole outlook.

David unearths his order's 1000-year-old rulebook, and demands his family follow it to the letter. Fiona starts her own business in defiance of the order's traditions, and Rachel tries to obtain a mobile phone. Aaron helps his dad to convert a non-believer, but his harrowing artwork of the apocalypse makes the wrong impression.

Rachel wonders if she can date without breaking the Order's rules, and makes a pious new friend whom she suspects knows a lot more about the outside world than she lets on. David struggles to get Fiona to pay attention to him, and decides to sit in on the church's teenage sex education class to get some romantic inspiration.

Fiona begins to harbour fantasies about Andrew, and her boredom with her marriage only gets worse when David reveals shows her a box containing his deepest, darkest secrets. At school, Aaron is encouraged to stop drawing non-believers being tortured in Hell, but David finds the new direction of his artwork challenging. Rachel turns to her parents for reassurance over her feelings for Joshua - but wishes she hadn't bothered.

David takes Aaron to a caravan for some father-son bonding, but there's no electricity and the only running water is leaking through the ceiling. Fiona hosts a girls' night.

At an annual cross-church party, Aaron waits to be baptised. But his head is turned by one congregation carrying rainbow flags. Fiona and Rachel argue over university.