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Liam and Garth are sent undercover to a maximum-security prison as the case against villain Vincent Hunter looks set to collapse.
The base of the group Liam and Garth are infiltrating has been attacked by ex-IRA men pursuing vengeance. The shoot-out tips Garth over the edge, and Liam must find him.
Garth realizes one of DCI Davies's team is working with Hunter and forms a strategy to identify the culprit before they get to undercover cop Debbie, a key witness.