When a former IRA man is abducted, DCI Tom Brannick is forced to confront an assassin who haunts his past, in order to crack the investigation in the present.

Tom continues to search for Pat Keenan’s kidnapper, hoping they will lead him to Goliath. But is somebody leading him down a false trail?

Tom and Niamh launch a manhunt for Adam Corry, who has disappeared in mysterious circumstances. Tori Matthews agrees to help Tom in the quest to identify Goliath, but as pressure builds on the police, Tom must confront the possibility Goliath may be someone close to him.

Tom Brannick enlists the help of Heather Pentland to find out what Jackie Twomey knows about Goliath. Tori Matthews and Tom's daughter, Izzy, put pressure on Tom to get to the truth. With lives on the line, Tom must unmask Goliath before it's too late.

The killing of a local accountant leads DCI Tom Brannick and DS Niamh McGovern into a web of intrigue surrounding the accountant’s widow, Olivia Foyle.

A raid on an abandoned house uncovers the hiding place of Robert Dardis. Tom is forced to use drastic measures to find the whereabouts of the gold.

Birdy steps into the breach and helps Tom to interview Olivia. Jackie is suspicious, and the accountant’s children have only negative things to say about his widow.

With the origins of the gold confirmed, an American gangster arrives in Dunfolan to take back what is his. Birdy makes a shocking discovery.

Tom is forced to deal with the killer in order to stay in the hunt for the gold, but a revelation from Izzy threatens to knock him off course.

Tom falters on the tightrope between his police investigation and his illicit pursuit of the murder weapon and the gold, as it all threatens to come tumbling down.