The Secret Martians

Jery Delvin had a most unusual talent. He could detect the flaws in any scheme almost on sight-even where they had eluded the best brains in the ad agency where he worked. So when the Chief of World Security told him that he had been selected as the answer to the Solar System's greatest mystery, Jery assumed that it was because of his mental agility. But when he got to Mars to find out why fifteen...