Shadow Operative (Adam Knight Thrillers Book 1)

Shadow Operative (Adam Knight Thrillers Book 1)

by Sam Cogley

4.4 (3,308)

4.4 stars from 3,308 reviews. Top 67% of Mystery Thriller books we track.


FreeFree100% off peak

Last checked: Jun 3, 2026

Price history: Free $0.99

Buy now — it's free!

Price range: Free $0.99

Buy on Amazon - Free

0 readers are tracking this book's price

Fans of these authors will like this...

  • Lee Child
  • Vince Flynn
  • Robert Ludlum

Fans of these books will like this...

  • The Bourne Identity
  • Patriot Games
  • American Assassin

Perfect for you if...

  • You love lean, globe-trotting thrillers with a damaged protagonist who's still the best at what he does.
  • You're drawn to espionage stories where the real enemy isn't always who the government says it is.
  • You want Jack Reacher energy but in a covert ops setting where the stakes involve classified weapons programmes.

Maybe not for you if...

  • You prefer character introspection and emotional depth over plot momentum and action sequences.
  • You're tired of the broken-agent-pulled-back-for-one-last-job premise and want something more original.
  • You dislike geopolitical thrillers or find government conspiracy plots exhausting rather than gripping.

About this book

Adam Knight is a skilled contractor for Penumbra Division, a covert U.S. government bureau operating in the world of espionage. After returning from a mission with a leg injury, Knight is assigned to investigate the murder of a renowned genetic scientist killed during a vacation in Greece. The suspect is a man believed to have died two years earlier. Knight's global pursuit of the murderer becomes increasingly dangerous as he encounters ruthless forces determined to keep their secrets hidden, including a deadly assassin committed to stopping him. His investigation uncovers a clandestine weapons program that poses a threat to global security and could shift the balance of power to dangerous hands. The case becomes a race against time as Knight navigates the blurred lines between right and wrong in the shadowy world of espionage.

Get the best deal every time

We track price drops, sale patterns, and predict when this book will go on offer next.

Price History

Kindle price over time. Green zones = periods when the book was free.

Sign up to unlock
Free$0.49$0.99Feb '24Aug '24Mar '25Feb '26Feb '26
Free$0.99

Currently free. Price has dropped 3 times over the last 2 years. Goes on sale roughly every 276 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

Sign up to unlock
#689#624,371#1,248,052Feb '24Aug '25Jan '26May '26

Currently around #37K in the Kindle store — a steady mid-list seller.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

Sign up to unlock
3.5★4.3★5.0★Feb '24Jun '24Oct '24Mar '26RatingReviews

Currently 4.4★ from 3,308 reviews

Gaining approximately 126 new reviews per month. Reader interest is accelerating. Rating has remained stable at 4.4 over the tracking period.

Sale Prediction

Sign up to unlock
Free$0.49$0.99Feb '24Aug '24Mar '25Feb '26Feb '26PredictedFeb '26

Actual Predicted

This book is currently free. Grab it while you can.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

Never miss a deal on this book

Create a free account to unlock full price history charts, sale predictions, and get notified instantly when the price drops.

Sam Cogley

1 book on Vagrant Press

View all books →

More Mystery Thriller books you might like

View all Mystery Thrillerbooks →
Pendergast: The Beginning (Agent Pendergast Series)
Pendergast: The Beginning (Agent Pendergast Series)

by Douglas Preston

$3.99Deal
4.7 (6,608)
$3.99$14.99
The Beijing Betrayal (A Marcus Ryker Thriller Book 6)
The Beijing Betrayal (A Marcus Ryker Thriller Book 6)

by Joel C. Rosenberg

$11.17Deal
4.7 (2,743)
$3.99$29.99
Gathering Mist: A Timber Creek K-9 Mystery
Gathering Mist: A Timber Creek K-9 Mystery

by Margaret Mizushima

$2.99Deal
4.7 (1,275)
$1.99$17.99

Today's Best Deals

View all deals →
Digital Fortress: A Thriller
Digital Fortress: A Thriller

by Dan Brown

$2.99Deal
4.3 (18,658)
$1.99$12.99
The Hit (Will Robie Book 2)
The Hit (Will Robie Book 2)

by David Baldacci

$1.99Deal
4.5 (52,796)
$1.99$11.99
The Class of Football: Words of Hard-Earned Wisdom from Legends of the Gridiron
The Class of Football: Words of Hard-Earned Wisdom from Legends of the Gridiron

by Schefter, Adam

$0.50DealHidden GemHighly rated but flying under the radar. Fewer readers have found this one yet.
4.0 (11)
$0.50$17.99
Meetings Suck: Turning One of the Most Loathed Elements of Business into One of the Most Valuable
Meetings Suck: Turning One of the Most Loathed Elements of Business into One of the Most Valuable

by Cameron Herold

$4.99DealHidden GemHighly rated but flying under the radar. Fewer readers have found this one yet.
4.2 (439)
$4.99$9.99
Buy Shadow Operative (Adam Knight Thrillers Book 1) on Amazon - Free

Affiliate link. We may earn a small commission at no extra cost to you.