Joe shares his love for military/espionage/political thrillers and his favorite authors from that genre -- John le Carré, W.E.B. Griffin, Tom Clancy, and Dan Brown. Surprisingly, it's not the action that he finds so fascinating; it's the ethical challenges faced by the protagonists.

From the Cold War to the Drug Wars and beyond, the Four Friends talk about their favorites in the genre...and why they love them.

• Tinker, Tailor, Soldier, Spy by John le Carré
• The Lieutenants (Brotherhood of War series) by W.E.B. Griffin
• Red Storm Rising by Tom Clancy
• The Da Vinci Code by Dan Brown
• The Women by Kristin Hannah
• Artificial Wisdom by Thomas R. Weaver
• The Lions of Lucerne by Brad Thor
• The List by Steve Berry