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Tom is confronted by an Irish terrorist who seems to be trying to help MI5, but nothing is as simple as it seems. Ellie and Maisie move into Tom's house, just as he's tricked into bringing a bomb home in a laptop…

The Grid was taken by surprise when an Irish splinter group's leader, Patrick McCann, walked into a safe house, armed with a grenade, demanding to talk to Middle East terrorist group Asabiyah.

He had crucial information on the group and would only talk to someone high-ranking, who had prior knowledge of its existence. After an emergency meeting Tom Quinn offers to meet McCann. Harry Pearce had his doubts and was deeply suspicious of McCannÂ’s motivation. After a vote was called, it was agreed that Quinn would meet McCann without wires and back-up, as requested.

The meeting took place in a field, where both men undressed, to prove they were not wearing wires. McCann informed Tom of what he knows. Asabiyah were planning to hit a British nuclear power station, Sefton B. His group has all the information MI5 needs. However, there was a catch. In return for the information on Sefton B, McCann wanted his group to go unwatched for 30 hours. Otherwise, no deal.

At the Grid, Pearce is appalled by the fact that Quinn and the rest of the team wanted to agree to the deal. Pearce pulls rank and says no, but Quinn went over his head, straight to the DG, and is given the go-ahead. However, Harry may have been right. It became apparent that McCann planned to bomb a busy London railway station. Pearce then admits that he had Quinn tailed, and he sends a take team to McCannÂ’s hideout, but he has already gone.

Quinn takes Danny Hunter and Zoe Reynolds aside, and tells them that they’re going to run an MI5 within MI5 – they organise a cover-up at the station, but let Pearce think they are following his plans. Although Hunter and Reynolds are unhappy about misleading Pearce, it seemed like the only thing to do, in order to stop the attack on the nuclear power station.

The cover-up was a relative success – the roof was made to look as though it had collapsed, leading to the station being closed. The bomb exploded with no human injury, but was it enough to fool McCann? It didn’t escape Pearce’s notice that he'd been fed lies, and Quinn was made to explain his reasons for going over his head, again. It was just a matter of meeting McCann and getting the information they need, in order to prevent a national disaster.

Meanwhile, the terrorist's plant a bomb in Agent Quinn's laptop, unfortunately, he was working from his maximum security home. With his family trapped inside will he have time to defuse the bomb??