Stonebridge, Scott and the S20 team get more than they bargained for when, on the eve of a historic nuclear-weapons summit, the British Ambassador to Thailand learns that his daughter has been kidnapped by a ruthless Bangkok gang led by an expatriate named Ray McQueen.

Locke and Section 20 regroup with Scott and Stonebridge tasked to bring in McQueen. The boys soon realise that Chloe's kidnapping is the tip of a much larger plot, one involving a North Korean crime syndicate, Office 39, and its ruthless Bangkok leader, Lee Dae-Ho.

Shiro, son of the Yakuza crime syndicate boss, ascends to power with the help of a duplicitous Lei, and vows revenge for his father's murder. While Section 20 fends off waves of attacks from the Yakuza, Scott's long-anticipated visit with son Finn is less than idyllic.

Hoping to track down Yakuza's shipment of vanadium, Scott strikes a deal with a pair of bounty hunters looking to kill Shiro. Having put his son on a bus to safety, Scott rushes off to rendezvous with his mates, who have closed in on Shiro and Mei in Southern Thailand.

Scott and Stonebridge cross the North Korean border in hopes of spoiling a nuclear-weapons celebration. Mission accomplished for now, Mei returns home and reunites with an old flame. In Bangkok, Finn chats with the wrong stranger and ends up running for his life.

In North Korea, Li-Na (aka Mei) is tasked by her mentor Moon Young-Su to pry a confession out of Scott & Stonebridge, using Finn as leverage. Meanwhile, Locke & Martinez recruit a familiar face in Russia to help get them into North Korea and attempt a rescue operation.

In Vienna, the phone of a Russian mobster, leads S20 to a rendezvous between Kwon and a bomb maker - a man Locke dearly wants to apprehend. Later, Scott and Stonebridge crash a bank heist in search of a document that holds the key to Kwon and Li-Na's diabolical plans.

With Nina's assist, Scott & Stonebridge track down an eccentric young encryption analyst hired by Kwon & Li-Na to access vital nuclear-material codes. Later, Locke comes face-to-face with his nemesis, while Scott & Stonebridge intercept the interceptors of a key convoy.

On the trail of Li-Na and Kwan, Stonebridge and Scott play a hunch and head to Geneva where a nuclear disarmament conference is taking place. A faceoff between Section 20 and the North Korean renegades ends in a flurry of gunfire... and an inconceivable betrayal.

Gone to ground, Scott and Stonebridge try to elude a team of mercenaries in the Swiss Alps in order to bring a traitor to justice. With their ammo nearly spent, the boys get a helping hand from an unexpected source before ending up in a final, epic fight to the finish.