Published in Mystery In Space #102 (Sep. 1965) with 8 color pages. Reprinted in Mighty Comic #51 (Australia, Feb. 1965).
Something is amiss at the Spaceways Toy Plant so the IPI sends operative Jan Vern undercover to check things out. He soon learns that gold smuggling is underway but the closer he looks, the more he sees something even more nefarious is underway - including an invisibility beam that could hide people.