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  • : 86
  • : 384
  • BBC One
  • 21
  • Action Crime Drama Mystery Thriller

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4
4x1
Episode 1
Episode overview
When a devastating bomb explodes in central London, causing multiple deaths, a terrorist group with a hatred for human life claim responsibility. With their leader facing extradition, .. show full overview
4x2
Episode 2
Episode overview
Zafar and Adam race against the clock to uncover the latest bomb. As a new ultimatum is issued and Tash mysteriously disapears, the team is forced to deal with the possibility of a mole within their own organisation.
4x3
Episode 3
Episode overview
Far-right political party The British Way is threatening democracy so Adam and Fiona go undercover to infiltrate and destroy its campaign.
4x4
Episode 4
Episode overview
Adam infiltrates a truck carrying illegal immigrants across Europe in order to stop a would-be terrorist.
4x5
Episode 5
Episode overview
A neo-conservative group murder an ex-minister to cover up his past and then they hunt down the journalist who is threatening to blow the story and is under MI5 protection.
4x6
Episode 6
Episode overview
MI5 suspect a terrorist is planning an attack from his prison cell.
4x7
Episode 7
Episode overview
The Syrian foreign minister tries to establish subversive contacts with MI5 at the opening of a cultural centre in London. Fiona is desperate to lead this mission and must confront her Syrian past.
4x8
Episode 8
Episode overview
An old British traitor is called in to infiltrate a Russian firm suspected of stealing secrets from GCHQ.
4x9
Episode 9
Episode overview
Harry upsets the CIA by stopping an extradition to the USA.
4x10
Episode 10
Episode overview
A former officer is convinced that MI5 killed Princess Diana and is determined to force the team to prove it.

Characters