Operator 5 #20: Scourge of the Invisible Death

No man could explain that death which struck from the stratosphere, turning men into statues, stripping the United States of defenses. Operator 5-Ace of the American Secret Service-uncovered an espionage organization which was working against our country when Washington recaptured Yorktown, in 1781!... But now, a madman with limitless ambition headed the Secret Loyalists, determined to make himself Emperor of America, and Operator 5 takes a million-to-one gamble which brings him face to face with disgrace and death!