A friend of Locke needs section 20's help when his daughter is kidnapped.

As Locke realises his long-term friend is working with the dangerous Yakuza and Office 39, Scott must protect his son when they come under enemy fire.

Scott and Stonebridge sneak into North Korea to destroy a factory where the vanadium is being processed. Finn is kidnapped. After destroying the factory Scott and Stonebridge surrender because Mei threatens to kill Finn.

Whitehall denies the existence of Scott and Stonebridge. Locke enlists the help of an old Russian friend to rescue his team. Li-Na uses Finn to coerce a confession.

The team head for Vienna following the lead on Li-Na & Kwon. From Nina's agent they get details of a meeting between Kwon and someone from Locke's past. They observe the meeting but things do not go according to plan.

Scott and Stonebridge chase Li-Na and Kwon and attempt to rescue Pirogova. Locke encounters "Oppenheimer" again and must decide his fate. Scott and Stonebridge discover Li-Na and Kwon's intended target with codes.

A group of mercenaries led by Faber and Mason, pursue Scott and Stonebridge as they seek payback.