Former military intelligence operative Major Rachel Dalton (Rhona Mitra) takes charge of Section 20. Its operatives work throughout Africa to recover four nuclear triggers which have fallen into the wrong hands after a mission in Somalia. The triggers were originally sold to Conrad Knox (Charles Dance), an English billionaire and philanthropist based in South Africa, who runs the Knox Foundation. The Foundation has been set up with the aim of disarming unstable regions, but it becomes apparent that Knox is arming his own militia with the weapons and is building nuclear weapons containing the triggers. He intends to liberate Africa "to a point where its voice is not just heard but listened to." Due to Knox's influence, Section 20 is forced to go dark to stop him.
