A graphic adventure in 4 parts from Thriller Picture Library #428, October 1962 - 64 pages.
The German supplies of war material had been cut to a small fraction of what they needed and now repairs and replacement parts were desperately low and defeat looked inevitable. Suddenly, though, an answer was found and soon parts and new equipment were again reaching the forces. This is largely thanks to a new factory hidden away. It is Spy 13's job to find its location and to do that, he decides to let himself be captured and made part of the slave labor forced to work there.