Episode 2

S6 E2: With Britain on the verge of a plague epidemic, the team race against time to find a vaccine quickly. To that end, Harry orders the interrogation of spies from all nations likely to have it - a task he hands over to a trusted former colleague, Connie James. Each of the detainees is exposed to the virus - a tactic that helps them locate Zaf, and leads directly to secrets about the government's relationship with Russia.