le Carré meets Black Mirror in this cerebral espionage thriller about secrets, power, and the cost of truth.
Intrigued? Well read on to discover the synopsis and an excerpt from M. B. Courtenay’s A Spy Inside The Castle, which releases on December 9th 2025.
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.
23
WORLD WITHOUT TIME
PEN UMBRA SUB BASE
MOONEN BAY, SCOTLAND
SEPTEMBER 26, 2022, 0207 BST
The massive metal door clanged shut behind Ethan with a deafening finality, the sound ricocheting through the cavernous submarine pen like the toll of a judge’s gavel. The boat ride had left him disoriented, his legs still adjusting to solid ground, but it was the darkness that truly disarmed him.
It was absolute. Heavy. A presence of its own.
Ethan took a cautious step forward, his shoes scraping against the damp concrete. No movement. No voices. Just the slow drip of unseen water somewhere deep in the shadows. His fingers fidgeted with the pocket watch in his coat, its weight anchoring him against the creeping unease.
Then, a sound—low, mechanical—sent a fresh spike of adrenaline through him. A flicker of red overhead. A single emergency light sputtered to life, casting just enough of a glow to reveal the corridor ahead. It was narrow, its walls a brutalist gray, the kind of place that felt like a Cold War fallout shelter.
This is straight out of the Brick Church metro station back in Jersey, Ethan thought, an old paranoia brushing against the back of his neck. A memory. No. This is worse.
Another red bulb sputtered on. Then another. A slow, calculated sequence, illuminating the corridor inch by inch.
Ethan inhaled sharply. This is the part where something moves. A shadow in the periphery, a figure emerging from the murk—waiting.
The final light stuttered, then held.
And there she was.
At the far end of the corridor stood a woman. Small-framed, dressed in white, her hands clasped.
Ethan’s muscles tensed, instincts firing. Not good. Why no guards? No weapons drawn? His mind raced through the possibilities—bait, projection, something worse.
Then, in a voice as warm as an old friend’s, she said, “Oh, there you are, deary!”
The incongruity hit him like a slap.
The woman’s tone was chipper, entirely unbothered by the setting. The dim red light bathed her silver hair, giving her the appearance of some spectral caretaker, but her expression—bright, amused—didn’t match the eerie backdrop.
“So sorry about the lights,” she continued, bustling forward with the ease of someone who had walked this corridor a hundred times. “Dreadfully old place, you see. We’ll have to get those fixed.”
Ethan blinked. His fight-or-flight response stuttered, unable to reconcile the sheer normalcy of her presence.
No weapons. No cryptic riddles.
Just an elderly British woman who looked as though she had stepped out of a Jane Austen adaptation.
Not a trap. Probably.
“Are you with… Castlemartin?” he asked, cautious.
“Of course, my dear! Rosemary Drake at your service.” She gestured at him with an eager wave, the silver bangles on her wrist jingling with every movement. “Now don’t just stand there gawking like a codfish. Come along, come along!”
Ethan hesitated only a beat longer before stepping forward, tension persistent in his shoulders.
“Sorry,” he muttered, forcing a chuckle. “Didn’t expect…”
“An old lady in a ghostly gown?” Rosemary finished for him, giving him a knowing smile. “Yes, well. Life’s full of surprises, isn’t it?”
Ethan’s lips quirked. “More than I’d like.”
Rosemary let out a laugh, patting his arm as she ushered him toward an elevator. “Oh, I like you already. Most Americans show up asking where the nearest pub is. But you? You look like you’ve just seen the Grim Reaper.”
“Give me time,” Ethan quipped. “I just got here.”
The elevator was sleek, stainless steel—completely out of place in the ancient stone structure. Ethan stepped inside, scanning the polished panel where Rosemary pressed a button labeled W.
He looked around. Sleek. Modern. Well-maintained.
Someone was funding this place. But who?
“W for… withdrawing rooms?” he guessed, his mind shifting to a long-forgotten museum exhibit at the Met.
“Oh, aren’t you a clever boy? Yes, indeed! Though in America, I suppose you’d call them living rooms or some other dreadfully uninspired name.”
“You’re a riot Ms. Drake,” Ethan said dryly.
“Oh, flattery will get you everywhere, dear.”
The elevator hummed as it ascended, the sound filling the silence between them. Rosemary studied him with a twinkle of curiosity in her eyes.
“You’ll find Castlemartin’s a funny old place, Ethan. Full of quirks.” She giggled to herself. “For example, do you know why we have so many clocks?”
Ethan arched a brow. “Why?”
“No idea!” Rosemary declared. “They’ve been here for generations, ticking away like old gossips. None of them agree on the time, mind you. It’s like living in a house full of argumentative uncles.”
Ethan half-smiled. “Sounds… charming.”
“Oh, it is, dear, once you get used to it.” She glanced down at his coat, still damp from the storm. “Oh, look at you! Drenched like a soggy biscuit. We’ll have to get you sorted out with a cuppa before you catch your death.”
Ethan glanced down at Margaret, his pocket watch, still clutched in his hand. Time’s more of a suggestion here.
