In the concluding episode of the series, six trainees remain on the course but only four of them will make it through to the final test overseas: exercise solo. This final challenge, a mission on foreign soil, has been designed to recreate the conditions for operating as an intelligence officer in a hostile environment. Dispatched to Marrakech, the final four must work entirely alone. Unknown to them, Control are also in the city and watching their every move as they move between locations and are given limited instructions. On arrival they must hand over their passports to an unknown contact before using their alias documentation to check in to a nearby hotel. Control have secretly rigged their hotel rooms with cameras and plan to test the trainees' behaviour as they ratchet up the pressure and suspicion. Battling rising paranoia, the trainees must try to act naturally, but one candidate struggles to maintain their composure.
