The trainees are challenged to covertly follow a target in a busy market, before their cover story skills, confidence and charisma are tested. And there's a mole among the trainees...

In an episode that explores the moral ambiguity of espionage work, the trainees enter a world of mistrust and paranoia as Control direct some of them to work against their colleagues as informers

The trainees are challenged to get information from unwitting strangers in a pub, then must work out if they're being followed or not, and have to select one trusted ally from their colleagues.

The remaining recruits are dispatched to Morocco, where each of them will operate undercover and face hostile interrogation techniques under extreme conditions. Can they maintain their cover stories?