Adam and Fiona's marriage is tested to breaking point when she insists on going undercover on an operation that leads straight back into her troubled past. But when events spiral out of control, will the team be able to get her out of danger in time?

With the world on the brink of war with Iran, the CIA are rounding up British Muslim citizens and illegally extraditing them. Harry makes a stand for their human rights and is sacked. Alone, he goes underground to try and clear his name.