The thrill-packed adventures of this brilliant young secret agent of the U.S. Naval Intelligence Service find him in hot pursuit of the powerful "Scorpion " leader of an international spy ring whose deliberate aim is to plunge the whole world into war.
How Don and his able assistant "Red" Pennington discover the Scorpion's submarine base; how Count Borg, one of the ring's cleverest agents is captured; and how Don, aided and abetted by that dountless Irishman, Michael Splendor, impersonates the Count and carries on his investigations in the spies' headquarters, makes a tale of heroic adventure that will keep every reader on the edge of their chair.