In the aftermath of the Romsey business, a German newspaper publishes British military secrets. Curtis decides that the traitor must be found and dealt with. He travels to France and retraces Romsey’s steps. Meanwhile, Albert is still suspicious of Curtis and decides that once he is away from Brussels he will reveal his true colours. Monique follows Curtis to France to watch him and finally prove whether he is trustworthy or not, while Curtis’ investigations lead him to the Neville residence.