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While Burns' team continue to piece together Olson's murder, Gibson realises that her serial killer is responsible for Annie's attack. Meanwhile, Spector faces questioning by Brinks.
While the investigation into Olson's murder reveals some uncomfortable truths, increased pressure is put on Gibson and her team in their hunt for the serial killer.
While Spector searches for his next target, Stella and Burns are interrupted by the news of the fatal shooting of a police officer.
When Spector takes his next victim, Stella’s fears are confirmed and she takes control of the investigation.
When Detective Superintendent Stella Gibson is called over to Belfast to perform a case review on an unsolved murder, she discovers similarities to a case from 18 months previously. She believes a serial killer is loose in Belfast, but her superiors are unwilling to make the connection.