Episode 5

S1, E5: Section 20, London: An investigation is launched into how British air support in Southern Helmand Province, Afghanistan failed, and it’s discovered that encryption codes were hacked into in the field. Evidence leads to a former missile guidance engineer, Gerald Baxter who served in Iraq but was dismissed, suffering with PTSD. Collinson sends Porter to Afghanistan to investigate. Posing as an arms dealer who can sell illegally gained ISAF missile codes, he is kidnapped by his contact and taken to meet Baxter. But the Americans locate them, attack the camp, capturing Porter and Baxter.