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![](https://ichef.bbci.co.uk/images/ic/320x180/p085jdwj.jpg)
Episode 10
10/10 A legendary ex-spy pays a visit to Thames House with a bomb and holds the team to ransom.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jdvz.jpg)
Episode 9
9/10 Harry's stand against the CIA's extradition policy on British Muslims gets him sacked.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jdpm.jpg)
Episode 8
8/10 The team investigate a Soviet investor who the government see as the saviour of the NHS.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jdpj.jpg)
Episode 7
7/10 Adam and Fiona's marriage is tested when she insists on going undercover.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jdnz.jpg)
Episode 6
6/10 A suspect planning a terror attack from prison is released to lead MI5 to other plotters.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jddp.jpg)
Episode 5
5/10 Harry discovers an ex-MI5 officer's suicide was staged and vows to avenge his murder.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jdd7.jpg)
Episode 4
4/10 MI5 discover that an Islamic terrorist is planning to enter the UK and launch an attack.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jdcp.jpg)
Episode 3
3/10 Adam goes undercover to destroy a far right political party from within.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jczk.jpg)
Episode 2
2/10 As the hunt for the bomb maker continues, Adam races to save the life of one of his team.
![](https://ichef.bbci.co.uk/images/ic/320x180/p085jcz5.jpg)
Episode 1
1/10 A terrorist bomb devastates London. Can MI5 catch the perpetrators before another strike?