Pete and Maddie's lives are changed forever, when the hospital calls them in for a meeting; they explain that their son Theo got mixed up at birth with the child of another couple, Miles and Lucy; the families meet to discuss their future.

Pete and Maddie begin the fight to keep Theo, but it's a costly and difficult process; the constant revisiting of their past strains their relationship.

Pete is questioned by the police and Miles leaks the story to the press, costing Pete his job; with his life unravelling, Pete realises that to save his family, he must dig into Miles' murky past.

Two couples discover their toddlers were switched at birth in a hospital mix-up and face a dilemma, do they keep the sons they have raised and loved or reclaim their biological child?