An MI5 agent is identified and tortured inside a Birmingham mosque. Show more

MI5's central computer is being hacked and the number one candidate is school teacher, Gordon Blaney. Show more

When $2 billion is stolen from the last British family-owned bank in London, MI5 is tasked by the government to track down the thief - and the money. Show more

The team take part in an EERIE (Extreme Emergency Response Initiative Exercise). They must act exactly as if there's a national emergency. Show more

When the President of the United States makes an unscheduled trip to the UK, it's a huge and complex operation. Show more

The French Intelligence Service wants to work with MI5 to catch an arms expert they suspect of trying to sell Eurofighter technology. Show more

In Miami, Florida, a known assassin is asked to come out of retirement for one last task - to kill an Englishman. The only thing is, he has to do it dead. Show more

Tom Quinn has disappeared after shooting his boss. He is also accused of assassinating the Chief of Defence Staff. Show more

Harry reawakens sleeper agent Fred Roberts, a renowned chemist and family man. Show more

Danny and the team must uncover the truth behind an assassination attempt on a famous novelist. Was he the real target? And who is the enemy?

The latest round of Middle East peace talks are abruptly halted when a key delegate is killed. Show more

MI5 are alarmed when they discover a group is hacking into computer systems across the country. Ruth investigates the possibility that terrorists might be behind the threat. Show more

A celebrity couple on the wane are terrified when their baby is kidnapped. They demand MI5 investigate, but soon MI5 learns that there's more to this kidnap than first appears. Show more

Suspicions are aroused when a known mercenary, recently linked to a new player on the arms smuggling circuit, is seen visiting an old Soviet arms dump. Show more

Danny and Fiona investigate a house they suspect is being used by North African terrorists. While the agents are installing a listening device, terrorists take them hostage. Show more

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

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

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

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. Show more

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