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September 15, 2026

HELL UNLEASHED — Beware of His Calm: Book Twelve of the CIA Cowboy Series

The Afghanistan War. A top-secret mission. And the calm that hides the storm. A closer look at HELL UNLEASHED, the twelfth file in the CIA Cowboy series.

Some men get loud before they get dangerous. The most dangerous ones never do.

HELL UNLEASHED — BEWARE OF HIS CALM is the twelfth file in the CIA Cowboy series, and it is the book where the war comes all the way home. Set against the backdrop of the Afghanistan War, it follows an operative carrying out a top-secret mission — the kind that never makes the news, never gets a medal, and never leaves the man who carried it.

A mission with no headlines

The Afghanistan War produced two kinds of stories. The ones the public saw, and the ones it never did. Hell Unleashed lives in the second category. It is built around a mission so sensitive that even the people fighting the war next door could not know it happened.

That is the world Sam Martin writes from — a world where the most important things an operator ever does are the things he can never talk about. The pressure of that silence, year after year, is its own kind of battlefield.

Beware of his calm

The subtitle is a warning, and it is the heart of the book. The hero of the CIA Cowboy series is not a loud man. He does not posture, threaten, or show his hand. When everything around him is burning, he gets quieter.

Seasoned operators will tell you the same thing about the real ones: the calm ones are the ones you watch. Composure under fire is not a personality trait — it is training, discipline, and the full weight of what happens if they lose control. In Hell Unleashed, that calm is tested harder than ever before, because the storm inside him is bigger than any firefight.

What readers will find in this file

  • The Afghanistan War, up close — the mountains, the missions, and the moral weight that came home with everyone who served.
  • A top-secret operation — a story that lives in the gray space where the Agency works and Washington looks away.
  • The cowboy code under maximum pressure — what happens when honor, loyalty, and survival pull in three different directions.
  • The series at full speed — twelfth in the run, written so a new reader can pick it up, but written to reward every reader who has followed the files from the beginning.

Where to start

If you are new to the series, you can begin with Hell Unleashed and work backwards — or start at File One and ride the whole trail. Either way, be warned: the calm is not an accident. It is the tell.

Get HELL UNLEASHED on Amazon — available in Kindle, Paperback, and Hardcover.


Filed by Sam Martin, The CIA Cowboy. Thirteen files and counting.