Eco-terrorists plan to flood London unless documents are published which reveal the government's environmental policy is a sham.

When MI5 are tasked to protect a high profile witness in a war crimes trial, a former traitor reappears and asks Adam to trust him.

A Muslim cleric advocating violence in the West is murdered by a Christian assassin.

Ros is trapped in the Saudi siege, forced to watch hourly assassinations as the government refuse to negotiate with the terrorists.

Whilst Adam and Zaf hunt a team of terrorists who have infiltrated Britain, Ros is left safeguarding a delegation of Saudi princess.

The government releases its report on the Cotterdam Seven - terror suspects killed in a prison fire. Harry senses a whitewash.

When the United Kingdom hosts the World Trade Summit for Africa, the team are posted undercover, right at the heart of the talks.

Zaf goes deep undercover, risking his life to infiltrate an Al-Qaeda cell that is on the brink of a crippling attack.

With their attempt on the Home Secretary's life foiled, the coup plotters decide to up the stakes in their battle with MI5.

The team are pushed to the limit as the country is plunged into chaos by a series of terrorist attacks.