"Dead Men Don't Lie" by J. Walt Layne.
X chases after wealthy politicians looking to finance enemy saboteurs and add to their ill-gotten gains.
"Face to Face with Agent Loki" by Andy Fix.
Secret Agent X battles his own counterpart, a German spy who is also a master of disguise.
"Devil in the Deep Blue Sea" by Fred Adams Jr.
From the early days of Secret Agent X's career, as he battles a sadistic U-Boat commander on the high seas.
"The Death Duel of Madam Rogue" by Frank Schildiner.
An old enemy from his past threatens to end Secret Agent X's career...and his life.