Arthur (Ken Stott) is a successful capitalist who will soon be promoted to an official. Sheila (Chloe Pirrie) is Arthur's daughter. This pure and kind daughter accepted the proposal of her boyfriend Gerald (Kyle Soller) at the family feast. The two got married. Arthur and his wife were obviously very satisfied with this marriage, but Sheila's brother Eric (Finn Cole) was obviously not very happy. Just when the family gathered together, the arrival of an uninvited guest made the five people feel alert. The man who claimed to be the inspector of the police station (David Thewlis) came to investigate and collect evidence for a case of female worker suicide, and the poor girl named Eva (Sophie Rundle) used to work in Arthur's factory and was fired by Arthur for leading a strike. Arthur didn't think he should take any responsibility for Eva's death, but as time went by, everyone gradually realized that in this small room, everyone was a sinner, whether intentionally or unintentionally.