当一名名叫John Porter的特工被一名巴基斯坦恐怖分子绑架时，英国中士Machael Stonebridge招募了前三角洲部队特工Damien Scott的帮助。然后，两人发现了新德里一家酒店可能发生恐怖袭击的线索，他们赶到那里阻止了袭击。

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.