Mystery Alley - The Fall

When a murder in Belfast remains unsolved after 28 days, DSI Stella Gibson is called in to review the case.

DSI Stella Gibson's worst fears are realised as Spector's murder spree in Belfast continues and she faces very real consequences after a reckless decision.

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.

When Eastwood's investigation into Olson's murder throws open some uncomfortable truths for Burns, Gibson comes under increased pressure in her hunt for Belfast's killer.

The killer's latest attack gives Gibson renewed impetus. As the net appears to be closing in, Spector makes a dramatic confession and a decision that binds his fate to Gibson.

Paul Spector is rushed to Belfast General Hospital where Dr Joe O'Donnell, nurse Kiera Sheridan and the staff fight to keep him alive.

Gibson and Burns are hauled over the coals by the police ombudsman and the policing executive for their handling of the case.

As Spector's health stabilises, his legal team, lead by Sean Healy, move into action, determined he will never stand trial.

Gibson comes face to face with the depths of Sally-Ann's desperation. Burns confronts his guilt at pursuing Sally-Ann as a conspirator.

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 series concludes as Gibson and Anderson put fresh evidence to Spector, with explosive results. Spector's new-found friendship with another inmate develops, with devastating consequences.