In the exciting fourth season, we fast-forward six years, discovering that Nikki (Esther Smith) and Jason (Rafe Spall) are experienced adopters having built a lovely little nuclear family, enriched by an extraordinary support network. However, as their teenage daughter, Princess (Scarlett Rayner), starts to yearn for a connection with her birth mother, Nikki and Jason find themselves confronted with the ultimate test of their parenting skills.
Series two joins Chris Carson six months later. Chris is attempting to rebuild his life, and his relationships, desperate to avoid the corruption that nearly sucked him under. He is trying to be a better police officer, a better man, and most importantly, a better father to his daughter Tilly. All whilst still dealing with the relentless trauma of being a night response officer. Chris wants a day job. Chris needs a day job. But is he prepared to risk everything to get one?