Let me start by stressing the importance of your assignment. As some of our most trusted agents in the organisation, only you are suitable for this difficult task.
I shall keep this short as time is of the essence – information has been received that suggest one of our rank is a double agent.
We believe the agent in question used an MI6 surveillance van last. Your assignment is to search this van for any clue as to the double agent’s identity. As master cryptographers, we trust you have the skills to succeed. In the interests of national security, you cannot fail in your task.
I repeat, you cannot fail.