A graphic adventure told in 4 chapters from Thriller Picture Library #282, July 1959 - 64 pages.
The year is 1941. The Germans have been scoring great victories with their U-boats and their air force has wrecked havoc with their new night bomber drones. Spy 13 is given a dual mission: find where the German U-boat refueling ship was located and learn how those night bombers had such terrific marksmanship.