Two talented police officers vie for supremacy on the streets of contemporary London in an eight-part crime thriller created by BAFTA Award nominee Paul Rutman. Detective Chief Inspector Daniel Hegarty (Peter Capaldi) has a long and distinguished career in the capital and he is determined to protect his legacy at all costs. An anonymous telephone call relating to an old case draws the attention of Hegarty and Detective Sergeant June Lenker (Cush Jumbo), who is eager to impress her superiors in the early stages of her career. Against a backdrop of institutional racism, the two detectives impose their chosen narratives on a historic murder conviction.