MI-5

After a bomb in Central London causes multiple deaths, the terrorist group responsible announce that crippling attacks will be launched at ten hour intervals.

As the hunt for the bomb maker intensifies, Adam races to save the life of one of his team.

After an MP crosses the floor to join a far right political party, MI5 take action to stop them winning their first parliamentary seat.

MI5 discover that an Islamic terrorist is planning to enter the UK and launch an attack. Adam infiltrates the route, and seems to persuade him to work for MI5.

When a legendary ex-MI5 officer kills himself, Harry is suspicious. It soon emerges that the death was staged.

When MI5 discover that a terror suspect is coordinating a major attack from his prison cell, they decide to release him.

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.

The team investigate a multi-millionaire Soviet investor who the government see as the saviour of the NHS. But is his offer of financial intervention too good to be true?

With the world on the brink of war with Iran, the CIA are rounding up British Muslim citizens and illegally extraditing them. Harry stands up for their human rights and is sacked.

An ex-spy pays a visit to MI5 with a bomb and holds the team to ransom, demanding they produce evidence that proves the Security Services assassinated Diana, Princess of Wales.