When Pete and Maddie find out something devastating about their son Theo, they soon meet another set of parents in the same situation.

Pete and Maddie begin an expensive and painful fight to keep Theo, but the constant dredging up of their past starts to damage their relationship.

When Miles leaks the story to the press, the fallout hits Pete who soon realises that he must dig into Miles' murky past to save his family.

The conclusion of the psychological thriller series. The final court hearing looms and the boys' fate must be decided as Pete and Maddie look set to lose everything.