The daughter of Thailand's British ambassador is kidnapped, so Stonebridge, Scott and the rest of the team sign up for another do-or-die trying adventure.
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's widow is working with the dangerous Yakuza and Office 39. Scott needs to protect his son after they find themselves under 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 risk war by entering North Korea, in an attempt to destroy the stolen Vanadium.
Scott and Stonebridge's capture attracts worldwide media attention, prompting Whitehall to deny their existence, whilst ordering Locke to stand down.
The battle with Li-Na moves to Europe as Section 20 searches for a way to get back on her trail, while Locke gets an unexpected opportunity to confront his arch-enemy.
Section 20 discovers that Li-Na is planning to mount a nuclear attack in Europe, while Locke puts himself in the firing line when he neglects his mission in order to avenge the hug of his son.
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.