Spector's legal team are determined that he will never stand trial. Anderson and Ferrington make a discovery from the past that may help Gibson build her case.

The episode was rated 7.74 from 1663 votes.

Gibson informs Burns that their confrontation in her hotel room may have been witnessed by Spector, and the detective is shocked to discover the serial killer has been paying visits to one of his surviving victims in hospital. Seizing on the opportunity, she finally locates Spector and puts him under surveillance, but her success is short-lived as she is forced to face her worst fears.

The episode was rated 7.73 from 1335 votes.

As DSI Stella Gibson takes control of the hunt for the serial killer striking women in Belfast, the realisation that his perfect kill is tainted pushes Spector into looking for his next victim.

The episode was rated 7.72 from 1621 votes.

It has been ten days since Paul Spector told DSI Stella Gibson that she would never catch him. As Gibson tries in vain to help Spector's surviving victim to remember the identity of her attacker, Spector is forced to deal with the loose ends that he left behind in Belfast. His return to the city reveals that someone from his past has been helping police with their enquiries, forcing Spector to change his plans with terrifying consequences.

The episode was rated 7.70 from 1536 votes.

DSI Stella Gibson's fears are realised as Spector's murder spree in Belfast continues.

The episode was rated 7.66 from 1702 votes.

As Spector's health stabilises, his legal team, lead by Sean Healy, move into action, determined he will never stand trial. Detective Superintendent Stella Gibson discovers evidence that there may be more victims. Keen to get Spector back into the justice system, Gibson speaks to August Larson, the consultant psychiatrist who will be assessing Spector. Sally-Ann reaches breaking point.

The episode was rated 7.58 from 1774 votes.

When a Belfast murder remains unsolved, Stella Gibson is brought in to catch the killer.

The episode was rated 7.57 from 2028 votes.

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?

The episode was rated 7.55 from 1835 votes.

Gibson comes face to face with the depths of Sally-Ann's desperation, while Burns has to confront his guilt at pursuing Sally-Ann as a conspirator rather than a witness. Gibson and Dr Larson clash over their different view of Spector - patient or prisoner? Meanwhile, Anderson and Ferrington are dispatched to London to discover if Spector can be linked to an old murder there.

The episode was rated 7.53 from 1706 votes.

Stella Gibson has arrested Spector but will he survive the gunshot wounds sustained in police custody? Will he ever face justice? Paul Spector is rushed to Belfast General Hospital where Dr Joe O'Donnell, nurse Kiera Sheridan and the staff engage in the blood-soaked fight to keep him alive. News of Spector's arrest and life-threatening injuries reach Katie and she plots to help him. With the powers that be questioning Gibson's handling of the case, her determination to get a conviction is tested to the full.

The episode was rated 7.44 from 2009 votes.