:Episode 5 - The Killing of a One-Eyed Bookie:

Red Troop is sent to protect would-be Unionist politician Bill Gracey in Northern Ireland after Special Branch receives information that there is going to be a hit. The SAS has to ensure it fails.

Jamie impersonates Gracey, living with his wife and children in a small village in South Armagh, guarded covertly by the rest of the team. When he leaves the house, followed by Henno and Caroline, Jamie unexpectedly reaches a police roadblock. As Henno tries to intervene, gunfire breaks out and, under a siege of bullets, Jamie is bundled into the terrorists' car.

The driver Sweeney realises with horror that Gracey is not Gracey at all. They have the wrong man, but it is too late to dump him. The throat mike reveals he is a valuable hostage - they need him as security.

Henno is furious, though his anger may be more a disguise for his genuine upset at losing a man, while Dotsy tries hard to push the official line of congratulations for a successful mission. But for the troopers it's not a good result. Jamie is somewhere in the Republic - dead or alive - and they have no way of reaching him.

The team learn the man who warned them about the hit is Jack Cullen, an undercover operative now working as a double agent high within the ranks of the IRA. Rumour has it, he and Gracey murdered a bookie. Cullen is sure to know where Jamie is being kept and Henno and Caroline break orders to head into the Republic to find him, while Twamley looks up an old flame in a bid to get information.

At the safe house, Jamie is being battered by interrogation, both mentally and physically. He's resilient, even under the torture of a burning poker. Then Maguire takes him outside and forces him into a grave. As Maguire raises his gun, Jamie finally breaks. Can Red Troop find him before it's too late?