Best Interests is the story of a family driven apart by having to make choices no parent would ever want to make. Andrew and Nicci's daughter, Marnie, has a life-threatening condition. The doctors believe it is in her best interests to be allowed to die, but her loving family disagree. They start a fight that will take them through every stage of a legal process, as they struggle to contemplate this huge decision. Who decides? And in whose best interests will it be?
The series is set in the fictional town of Port Devine on the Northern Ireland coast and will focus on Port Devine's police department - and the mysterious arrival of English Detective Constable Alimah Kahn, the first Muslim police officer in the town's history. The character-led series combines a long-running serial narrative with self-contained crime stories in each episode.