The remaining recruits each face the final, notoriously gruelling stage of selection alone: 24 hours of intense interrogation without losing composure or revealing details of their mission. Between interrogations, they are locked in a cell and hooded in stress positions and are subjected to repetitive music at random intervals to maintain a state of severe fatigue. Less than 10 per cent of candidates make it through this process in the real world. Will any of the civilians make it to the end and prove they have the characteristics needed to succeed in the special forces?