Do or Die is an episode from Series 22 that first aired on 9 December 2005.
As Burke's team begin to investigate a suspicious death at an Army Training Camp, they find that the civilian rules don't apply. Recruits are being trained for the demands of war zones where they must prepare to kill or be killed, and information is given on a need to know basis only. DI Robbie Ross moves into the camp to try and understand the mentality of the trainees and the regime. But can Ross prevent more soldiers being killed? The rest of the team try to catch the murderer.