MI-5

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

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

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

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

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

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

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

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

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

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