When a young boy is murdered, this small town of Broadchurch in When a young boy is murdered, this small town of Broadchurch in Dorset suddenly becomes the focus of a major event in the full glare Dorset suddenly becomes the focus of a major event in the full glare of the media spotlight. DI Alec Hardy (David Tennant) and DS Ellie of the media spotlight. DI Alec Hardy (David Tennant) and DS Ellie Miller (Olivia Colman) lead the investigation. Miller (Olivia Colman) lead the investigation.