But when - on the hottest day of the year - her strict morning routine is disrupted, Susannah finds herself running on autopilot. It is hours before she realises she has made a devastating mistake. Her baby, Louise, is still in the backseat of the car and it is too late to save her.

As the press close in around her, Susannah is put on trial for negligence. It is plain to see that this is not a trial, it's a witch hunt. But what will the court say?