The plans for the Ziegler heat ray have been stolen and are presently in the Arvanian embassy, where they are officially off-limits to the Americans. The American Secretary of War expects them to be smuggled out of the country at any moment. Arvania will then develop the weapon and, despite its postage-stamp size, become the most powerful nation on earth. The next logical step will be for it to declare war on the United States, which will lead to its downfall inside of three months!
What is the mystery centered in Jupiter's famous "Red Spot"? Two fighting Earthmen, caught by the "Pipe-men" like their vanished comrades, soon find out.
