Series 4 (2005)

The Special (1)
9.0

September 12, 2005

When a devastating bomb explodes in central London, causing multiple deaths, a terrorist group with a hatred for human life claim ...Read more

The Special (2)
9.3

September 13, 2005

Zafar and Adam race against the clock to uncover the latest bomb. As a new ultimatum is issued and Tash mysteriously disapears, th...Read more

Divided They Fall
9.0

September 22, 2005

Far-right political party The British Way is threatening democracy so Adam and Fiona go undercover to infiltrate and destroy its campaign.

Road Trip
9.0

September 29, 2005

Adam infiltrates a truck carrying illegal immigrants across Europe in order to stop a would-be terrorist.

The Book
9.0

October 6, 2005

A neo-conservative group murder an ex-minister to cover up his past and then they hunt down the journalist who is threatening to b...Read more

The Innocent
9.3

October 13, 2005

MI5 suspect a terrorist is planning an attack from his prison cell. Guest stars Jimi Mistry.

Syria
9.3

October 20, 2005

The Syrian foreign minister tries to establish subversive contacts with MI5 at the opening of a cultural centre in London. Fiona i...Read more

The Russian
9.0

October 27, 2005

An old British traitor is called in to infiltrate a Russian firm suspected of stealing secrets from GCHQ.

The Sting
9.3

November 3, 2005

Harry upsets the CIA by stopping an extradition to the USA.

Diana
9.3

November 10, 2005

A former officer is convinced that MI5 killed Princess Diana and is determined to force the team to prove it.