A graphic adventures told in 5 parts from Thriller Picture Library #310, March 1960 - 64 pages.
The capture on an RAF base of a Pole worker there who had blown open a safe to steal secret documents brings Spy 13 to that facility where it is suspected that a German spy organization was at work in the area and forcing the Pole to work for them. Taking the man's place, David Doughty will find the thread leads to a much bigger menace.