A sniper attempts to kill the President of Zimbabwe. Since there is evidence that the sniper could be British, Porter is sent in undercover to locate the sniper and silence him.

Collinson travels to South Africa to confront the contact who betrayed section 20, but finds it may be too late; while Colonel Tshuma launches a manhunt to find Porter and Masuku.

Porter is sent to Afghanistan to find a computer hacker who has cracked the British army's missile guidance codes. The hacker has successfully found a way to redirect missiles to strike American forces.