A Spy Inside the Castle

An Ethan Briar Novel: Book 1

By: M. B. Courtenay

Narrated by: Grover Gardner

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.

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.

©2025 M. B. Courtenay (P)2025 M. B. Courtenay

Entertaining!

This is the first book in the Ethan Briar series, and it’s a very entertaining start. I really enjoyed the mystery, the intrigue, and all the twists and turns. The characters are well developed, and the writing is imaginative, original, and captivating. Grover Gardner did a great job bringing this story to life and added a lot to the overall experience. I’m definitely looking forward to more in this series. I received a free copy of this book via Booksprout and am voluntarily leaving a review.

Thrilling

A Spy Inside the Castle by M. B. Courtenay is an excellent techno thriller. Grover Gardner did an incredible job with the narration. The story is entertaining, thrilling, enjoyable, exciting, interesting, intriguing, captivating, and more. A Spy Inside the Castle is the first book in Ethan Briar series.

I received a free copy of this book and am voluntarily leaving a review. Highly recommend