British sergeant Michael Stonebridge recruits help from Ex-Delta Force operative Damien Scott when an agent named John Porter is kidnapped by a Pakistani terrorist. The two then uncover clues to a possible terrorist attack at a New Delhi hotel and they race there to foil it.

An Indian general decides to hold off on the assault on a New Delhi hotel that has been under siege when he learns that Scott and Stoneridge are in the hotel and they have ID'd the weapons scientist known as Mahmood.

Section 20 tracks Latif to South Africa, when a former IRA terrorist Daniel Connolly, targets a weapons-system designer. Scott switches places with a computer hacker and finds himself being lured into a dangerous honey trap.

Scott manages to pass Connolly's explosive test and works on bypassing a security code. Bratton contacts Marshall.

There is trouble looming for Claire. Scott and Stonebridge attempt to locate a global arms dealer.

Grant travels to Khartoum when Sinclair and Scott are arrested. Clare is offered a choice by Tahir of either death or starting a new life as his partner. Stonebridge blames himself for Kate's death/ Crawford reveals that Latif has embedded a spy at the top of Western intelligence but refuses to reveal the person's identity until Clare is returned alive.

An MI6 agent called John Allen ends up takeing Stonebridge and Scott from Vienna on a dangerous mission to Kosovo.

In Kosovo, Stonebridge, Scott and four hostages find themselves in dire straits after being double-crossed by KFOR soldiers and the drug lord Hasani.

Scott and Stonebridge head to Chechnya to track down Latif and a stockpile of chemical weapons.

In the season finale, Stonebridge and Scott are in a race against time to find a pair of suicide bombers targeting Budapest.