Detective Superintendent Stella Gibson is brought in from the London Metropolitan Police to help catch the killer when a murder in Belfast remains unsolved. As Gibson travels across from London, we are introduced to the murderer himself; Paul Spector. Gibson and Burns are hauled over the coals by the Police Ombudsman and the Policing Executive for their conduct and handling of the case. When Spector's name is released to the press as the arrested suspect in the Belfast Strangler case, his wife and family are forced to deal with the consequences. Katie enraged at the media treatment of him, decides to take matters into her own hands. All the while Nurse Kiera Sheridan and the medical team continue to fight to keep Spector alive. But even if he survives will he ever be fit enough to stand trial?