A graphic adventure in 4 parts from Thriller Picture Library #360, May 1961 - 64 pages. It was reprinted in Secret Agent Picture Library Holiday Special 1969.
The end of WWII was approaching but the Germans were finally making progress on their atomic bomb research. It is revealed that at the very beginning of the War, a German nuclear scientist working in the UK named Krause was substituted by a very smart British agent who has over the years been stymying Germany war efforts. Now he has been captured and Spy 13 is sent to get him out and to stop the progress.