A graphic adventure told in 5 chapters from Thriller Picture Library #258, January 1959 - 64 pages.
Spy 13 tracks a well known German Baron as he sees to the transport of a very large amount of specialized munitions. His goal is to learn what new and dangerous weaponry is about to be unleashed against the Allies. It is large tank-like vehicles called Sand Spiders walking on stilts and raining down from higher up.