Section 20 try to track down the real culprits behind the embassy attack, starting with getting information from gangster Ray McQueen.

Locke works out that his long-time friend is working with the dangerous Yakuza and Office 39. Scott needs protect his son after they find themselves enemy fire.

Scott has a serious talk with his son whilst the rest of Section 20 form an uneasy alliance with a couple of CIA mercenaries as they go after Shiro and Mei Foster.

Scott and Stonebridge make a major mistake and fall into the clutches of North Korean agent Li-Na, leaving Locke having to defy orders to get them out.

Scott and Stonebridge make a major mistake and fall into the clutches of North Korean agent Li-Na, leaving Locke having to defy orders to get them out.

The battle with Li-Na is now in Europe, as Section 20 look for a way to get back on her trail. Locke ends up getting an unexpected chance to confront his nemesis.

The team find out that Li-Na is planning to mount a nuclear attack in Europe. Locke puts himself in the firing line after he neglects the mission in order to avenge his son's murder.

Locke takes Section 20 off the radar, as they defy Whitehall to travel to Geneva where he is convinced that Li-Na and Kwon are preparing to attack the United Nations HQ.

Scott and Stonebridge head out for a final showdown with Li-Na, in an effort to avenge Richmond’s death and save Locke’s career and their own lives before a bomb goes off in Europe.