A graphic adventures in 4 parts from Thriller Picture Library #324, July 1960 - 64 pages.
Elderly French scientist Professor Legrand was not only quite noted in his field but also a member of the Maquis resistance. When he is captured by the Germans and scheduled to be sent to Germany to be forced to work for them, Spy 13 is sent to Paris to rescue him. One handicap to the plan is the old man has a broken leg.