Price: $12.99 - $0.99
(as of Jan 16, 2026 13:26:15 UTC – Details)


le Carré meets Black Mirror in this cerebral espionage thriller about secrets, power, and the cost of truth.
When intelligence analyst Ethan Briar is drawn into a covert mission on the windswept Isle of Skye, he enters a world where nothing is as it seems. An abandoned supercomputer, a defector’s warning, and the specter of a long-buried betrayal set the stage for a high-stakes investigation with global implications.
*
“…the most atmospheric book I’ve read this year.”
— Spybrary

“Le Carré meets Black Mirror in this cerebral espionage thriller about secrets, power, and the cost of truth.”

— The Nerd Daily

“A page-turner with real literary depth.”

— Kirkus Reviews

“An intricate novel that possesses continual intrigue… a fascinating thriller about those who hold power—those who are fooled by it, and those who fight against corrupt power structures.”

— Foreword Reviews (Clarion)

“A fascinating espionage tale that blends gritty spycraft with a mystical twist and unrelenting suspense. One of the most interesting fusions in the thriller genre.”

— BestThrillerBooks.com

“A real page-turner… a promising start of a great series. A fresh, chillingly plausible blend of classic espionage and high-tech conspiracy.”

— MysterySequels.com

At Castlemartin Manor—a decaying stronghold for a once-cutting-edge surveillance program—Ethan is forced to navigate shifting loyalties, encrypted legacies, and the labyrinthine politics of modern intelligence. As the storm outside intensifies, so does the war within: between faith and cynicism, memory and manipulation, human judgment and machine prediction.
Gripping, intelligent, and hauntingly prescient, A Spy Inside the Castle explores the intersection of technology and truth in an age where perception is weaponized—and no one is beyond suspicion.
ASIN ‏ : ‎ B0FLWW78BF
Publisher ‏ : ‎ Castlemartin
Accessibility ‏ : ‎ Learn more
Publication date ‏ : ‎ December 9, 2025
Edition ‏ : ‎ 1st
Language ‏ : ‎ English
File size ‏ : ‎ 4.3 MB
Screen Reader ‏ : ‎ Supported
Enhanced typesetting ‏ : ‎ Enabled
X-Ray ‏ : ‎ Not Enabled
Word Wise ‏ : ‎ Enabled
Print length ‏ : ‎ 291 pages
ISBN-13 ‏ : ‎ 979-8218691462
Page Flip ‏ : ‎ Enabled
Best Sellers Rank: #339,601 in Kindle Store (See Top 100 in Kindle Store) #734 in Technothrillers (Books) #861 in Technothrillers (Kindle Store) #1,694 in Conspiracy Thrillers (Kindle Store)
Customer Reviews: 4.6 4.6 out of 5 stars (9) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });