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Lost Asset

Penumbra Division Thrillers #4 / 4
by Sam Cogley
Lost Asset (Penumbra Division Thrillers #4) by Sam Cogley
⧗ 8.00 / 1
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The Cold War Made John Bishop a Legend. Now Europe's Deadliest Terror Attack Drags Him Back into the Field for a War He Was Never Built to Fight.

Madrid, March 2004. John Bishop is decades removed from the field, a Cold War spymaster who belongs behind a desk. But when he boards a packed commuter train with his most trusted assistant at his side, the morning ends in fire, twisted steel, and one hundred ninety-three people dead.

The bombing wasn't the work of terrorists alone. The explosives trace back to a shadowy arms dealer known only as the Gray Ghost—a phantom who runs his empire like a resistance cell, supplying terror to anyone who can meet his price. Those who get close to his supply chain find only dead ends. Those who get closer don't come back at all.

As director of the CIA's most classified unit—Penumbra Division—Bishop should leave the hunt to younger operatives. But this one is personal, and he won't hand it to anyone else. From the streets of Madrid to the back alleys of Casablanca, Bishop follows a trail that grows more devastating with every step.

As the ghosts of the Cold War collide with the War on Terror, can an old spy in a young man's war prevent a nightmare of his own making before it's too late?

If you devour the pulse-pounding espionage thrillers of Tom Clancy, Robert Ludlum, Daniel Silva, Vince Flynn, and Brad Thor, then prepare for Sam Cogley's biggest yet—LOST ASSET.

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ThrillerSpy ThrillerSuspense Thriller
Release date: September 14, 2026

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Sam Cogley

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 three books and series is set to expand with the upcoming release of one more book. The current recommended reading order for the series is provided below.

The Last Operator (Penumbra Division Thrillers #1)
Unrated
Cold Fire (Penumbra Division Thrillers #2)
⧗ 8.00 / 1
The Triangle (Penumbra Division Thrillers #3)
Unrated
Lost Asset (Penumbra Division Thrillers #4)
⧗ 8.00 / 1


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