The teenagers are trapped in the building, and Polly directs her anger at the development's project leader Harriet, but is shocked to realise it might be her daughter who gets the blame
In the aftermath of the tragedy, Polly worries that Iwan might be hiding something. Angela gathers the families to fight for justice, while Harriet faces questions at work.
The inquest opens and questions are asked of Iwan, Alan and Harriet. Polly is forced to choose between her husband and justice when she's asked to betray Iwan.
Harriet is in the dock for gross negligence manslaughter as the families' private prosecution finally arrives in court. And Polly fears for Leona who wants to give evidence.