The Accident

An explosion on the construction site of a much-needed regeneration project claims the lives of several teenagers who have broken onto the site to make mischief.

In the aftermath of the tragedy, Polly worries that Iwan might be hiding something; Angela gathers the families to fight for justice; Harriet faces questions at work.

The inquest opens, and hard questions are asked of Iwan, Alan, and Harriet; Polly is forced to choose between her husband and justice when asked to betray Iwan to get evidence; Harriet's boss presents her with an impossible choice.

Harriet is in the dock for gross negligence manslaughter, as the families' private prosecution arrives in court; Polly fears for Leona, who wants to give evidence, but it's her relationship with Iwan that presents the most challenging questions.