The Triangle
The War Has Begun. The Weapons Haven't Been Found. And Now, the One Person Sent to Find Them Has Vanished.
October 2003. Six months after the Iraq War began, no weapons of mass destruction have been found. The CIA, desperate to avoid another intelligence blunder, quietly passes the hunt to the one unit that doesn't officially exist: Penumbra Division.
Jermaine Falls, the division's newest recruit, is sent in to find what no one else can. But when Falls disappears inside Baghdad's Red Zone, the mission shifts from locating weapons to finding one of their own.
John Bishop knows he should cut his losses. Falls knew the risks. But Bishop can't let this one go. With no room for failure, he turns to the only person capable of pulling off an off-the-books rescue under the noses of not just the enemy, but the CIA itself.
Lauren Rampling follows Falls's trail into the most dangerous territory on earth—a lawless war zone where insurgents, militias, and something much more sinister await. With a team of trusted mercenaries along for the ride, what she uncovers goes far beyond a missing operative—it's a secret that could send the already volatile conflict spiraling out of control.
Can Rampling survive long enough to bring her people home alive? And with Bishop and his best operative gone rogue, will the unsanctioned assignment be the one that finally destroys Penumbra Division from within?
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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.
Penumbra Division Thrillers
Penumbra Division Thrillers consists of four books. The current recommended reading order for the series is provided below.
