Neptune-Six
The Jungle Holds Secrets. The Rebellion Holds Hope. Knight Holds the Line.
In the small South American nation of Vincidoria, a rebellion clings to survival. Isabella Rodriguez, its beloved leader, becomes the target of the country’s despotic President and his ruthless death squads, forcing her to request asylum from the United States government.
With the CIA rescue operation of Rodriguez in tatters, the elusive Penumbra Division takes command of the extraction and deploys their top operative—Adam Knight.
Arriving in Vincidoria with no contacts and surrounded by enemies, Knight faces an adversary more deadly than he anticipated—the Oscura, Vincidoria’s secret police. Dedicated to crushing dissent with brutal efficiency, the Oscura pose a threat not just to the rebels but to any foreign operatives.
The simple extraction rapidly descends into chaos as Knight stumbles upon a web of dark forces with stakes far beyond Vincidoria’s borders. Can he safeguard the world against the hidden enemy, or will he be destined to disappear into the South American jungle forever?
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Sam Cogley
My passion for storytelling began as a child, sparked by the exploits of James Bond and the action films of the 80s and 90s. As I grew, I found inspiration in the literary works of Tom Clancy, Michael Crichton, and Lee Child.
In 2024, I released my debut novel, Shadow Operative, the first in the Adam Knight Thriller series. What began as a single book has since grown into a fast-paced, globe-trotting series spanning five novels...and counting.
In June 2025, I launched a spin-off set in the same universe centering on Penumbra Division, starting with The Last Operator.
In early 2025, I signed a multibook deal with Boldwood Books to launch a brand-new series featuring Dane Winter, an elite ex-soldier turned freelance operative. The first book, Hostile Asset, was released in October.
My second Penumbra Division book will be available in Mid-November.
Off the page, I’m a devoted husband and proud father to a son and daughter. Without them, none of this would be possible.
Adam Knight Thrillers
Adam Knight Thrillers consists of six books. The current recommended reading order for the series is provided below.
