Dusty Ayres and His Battle Birds #3: The Purple Tornado in Bloomington, MN

Thick, deadly, that curtain of purple gas stretched along our border from Maine to the Great Lakes. What did it hide? What gigantic war scheme was the enemy preparing behind it? The Fate of America depended upon knowing these answers in time-and grimly Ayres vowed to find out, flying a one-man patrol against the greatest military coup ever planned!