Brian's suspected killer is arrested. With the evidence piled high, Nikki and Rory are confident that they have their murderer.
Seven suspects are identified following Brian's murder, each with their own motive for committing the crime.
Sharon's life comes crashing down around her when she's hit by an earth shattering accusation.
Following her nightmare encounter with Joe Fallon, Bridget resolves to take control of her life again by any means possible.
The Kielys put the second part of their revenge plot into operation, but Joe isn't going down without a fight.
Rory realises he might have bitten off more than he can chew in his desire for promotion.
Deprived of heroin, Conor struggles to cope when unwillingly forced to go cold turkey.
Nikki is furious with Rory for going behind her back to score points with their boss.
Sean makes a last ditch attempt to persuade Adrijan not to leave Ireland.
The investigation into Brian's murder throws up some unthinkable twists and turns for Detective Rory.
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