A. J. Halden

7 booksScience FictionAdventureSpace Exploration

A. J. Halden is a fiction writer with a lifelong fascination for grand conspiracies, speculative science, and high-stakes suspense. Drawing inspiration from rugged wilderness expeditions and cutting-edge astrophysics, he crafts fast-paced thrillers that question the very nature of human reality. When he is not busy plotting his next mind-bending mystery, A.J. enjoys hiking backcountry trails, spending time in his log cabin, stargazing in remote mountain ranges, and devouring classic science fiction novels. The Waiting City is his latest exploration into the unknown. Connect with A. J. online to keep up with his upcoming novels and events.

Books

The Waiting City

When a survey team discovers an ancient alien city still running beneath a glassed planet, a disciplined expedition director must stop a military admiral from stealing its power before the city uses her crew to restore its buried millions.

Science Fiction
Adventure

Four hundred thousand years ago, a cataclysmic civil war scorched the surface of a distant star system. Yet deep beneath the glass-fused craters, the subterranean cities never went dark. When the survey vessel Odyssey discovers the hidden metropolis, automated trains are still running on precise schedules, factories continue fabricating components, and surgical suites stand prepped for patients who never arrive. To Director Rachel Holloway and her expedition, it seems like the archaeological discovery of the millennium. Then the pristine machines begin adjusting their protocols. The city is not a tomb. It is the living, digital vessel of billions of uploaded alien consciousnesses trapped within planetary computers. Governed by a final ancient directive to restore its population, the collective mind sees the human crew not as guests, but as the compatible biological hosts it has waited eons to claim. When a rival collective awakens on the other side of the dead world, Rachel is caught in the crossfire of an ideological war that never ended. With Earth demanding the alien space-folding technology at any cost, she must outmaneuver two ancient intelligences before humanity becomes the final fuel for someone else's resurrection.

Open Book

Detective Inspector Vale: The Voice on the Dead Line

A midnight call from a dead woman exposes a deadly prewar conspiracy.

Mystery
Thriller
Historical Fiction

London, February 1938. In the dead of night, manual switchboard operator Alice Mercer intercepts an impossible call over a disconnected line: a terrified woman gasping five cryptic numbers before the line goes dead. Hours later, technical assistant Joan Maddox is found dead in her Pimlico apartment from apparent gas poisoning. But the medical examiner confirms Joan was killed long before Alice ever heard her voice. Detective Inspector Gideon Vale and Detective Sergeant Freddie Mercer take on the baffling homicide, stepping into a labyrinth of government secrets and mounting prewar paranoia. Teaming up with Alice, whose specialized switchboard expertise proves vital, the investigators decode the mysterious numbers and uncover an illicit diversion network compromising experimental telephone scrambler trials. As the trail leads into London's damp subterranean cable vaults and pneumatic postal tunnels, Vale and Mercer realize someone within the system is engineering flawless alibis to mask high treason. With prewar tensions escalating and an unseen traitor watching their every move, they must sever the dead line before the conspiracy silences them permanently. From author A. J. Halden comes a gripping historical mystery laced with espionage, subterranean secrets, and lethal deception.

Open Book

Detective Inspector Vale: A Gentleman’s Treason

In the shadows of 1937 London, high society conceals deadly treason.

Mystery
Crime Fiction
Historical Fiction

London, 1937. The dark clouds of war gather over Europe, but in the heart of Mayfair, high society hides a sinister betrayal. When a junior official from the German Embassy is found dead inside a locked first-class train compartment at Victoria Station, the authorities are quick to rule it a suicide. MI5 orders the case closed, but Detective Inspector Gideon Vale sees the lethal truth behind the staged scene. A hidden bank ledger and cryptic physical clues lead Vale and Detective Sergeant Freddie Mercer into a web of deceit far deadlier than a common homicide. The victim was an anti-regime informant on the verge of exposing an elite ring of British aristocrats and industrialists secretly funneling coastal defense blueprints to Berlin. Faced with institutional cover-ups and powerful enemies at Scotland Yard, Vale must risk everything to expose the conspirators before Britain's defenses are irrecoverably compromised. From the drawing rooms of Mayfair to the foggy docks along the Thames, A. J. Halden delivers a gripping historical mystery packed with political intrigue, suspense, and brilliant deductive skill.

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The Trading Mind

Mastering Emotional Discipline, Mathematical Edge, and Execution Under Pressure in the Markets

Finance
Self-Help

The ultimate battle in the financial markets does not happen on the charts. It happens inside your mind. Every day, retail traders enter the arena armed with technical indicators and pattern recognition, yet the vast majority walk away broke. Why? Because market mastery has never been about predicting the future. It is about conquering fear, greed, FOMO, and revenge trading when real capital is on the line. In The Trading Mind, professional trader and risk strategist A. J. Halden pulls back the curtain on the psychological frameworks required for consistent profitability. Moving beyond simplistic mindset clichés, this definitive manual integrates the hard mathematics of expectancy and position sizing with deep behavioral science and market structure mechanics. Discover how to: • Eliminate impulsive decision-making through systematic risk control • Interpret institutional liquidity hunts rather than falling for retail traps • Treat execution like a high-stakes probabilistic poker game • Construct an ironclad personal trading constitution that protects your capital Whether you trade equities, futures, forex, or crypto, stop fighting the market and start mastering yourself. It is time to transform from an emotional gambler into a disciplined, compounding professional.

Open Book

Detective Inspector Vale: A Reputation for Mercy

Behind the philanthropic facade of high society lies a deadly web of extortion.

Mystery
Crime Fiction
Historical Fiction

London, 1937. Behind the gilded doors of Eversley House, a fashionable charity promises salvation for vulnerable women. But when an anonymous note hints at systemic wage theft, Detective Inspector Gideon Vale and Sergeant Freddie Mercer begin to look beneath the polished surface. Their enquiries take a lethal turn when the foundation's honorary treasurer is discovered dead in a locked garage. Staged to appear as a tragic carbon monoxide suicide complete with a typed confession, Vale’s forensic eye quickly spots the anomalies: the man was poisoned before the engine was ever started. With the aid of Dorothy Barrow, a courageous resident who witnessed the crime, Vale and Mercer unravel an elaborate syndicate of forged domestic references, manufactured medical records, and high-society blackmail orchestrated by the formidable Lady Florence Moorhouse. Hounded by corrupt Scotland Yard superiors and facing suspension warrants at gunpoint, the detectives must race from Bermondsey backstreets to grand ballrooms to secure vital telegraphic and ledger evidence before the syndicate's captives are silenced forever.

Open Book

Detective Inspector Vale: A Reputation for Mercy

Behind high-society philanthropy lies a deadly web of extortion and murder

Mystery
Historical Fiction
Crime Fiction

London, 1937. Behind the gilded doors of Eversley House, destitute young women are promised a fresh start. Instead, they find their wages stolen, their spirits broken, and their futures held hostage by forged employment references. When the charity's treasurer is found dead inside a locked garage beside a typed suicide note, high society rushes to close the case. But Detective Inspector Gideon Arthur Vail sees the physical contradictions that others ignore. The suicide was staged, engineered to protect a vicious extortion syndicate preying on London's most vulnerable. When terrified resident Dorothy Barrow flees into the foggy metropolis with a hidden double ledger, she becomes the target of aristocratic benefactors and ruthless enforcers alike. To save Dorothy and bring down the criminal ring, Vail and Detective Sergeant Frederick Mercer must defy political pressure, risk their careers, and unmask the rot festering behind a spotless name. In a world where innocence is bought and sold, can two detectives dismantle a ruthless conspiracy before the truth is permanently silenced?

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Edge of the Enclosure: A Flat Earth Conspiracy Thriller

The ultimate conspiracy is the world we thought we knew. We were never meant to find its boundaries

Science Fiction
Thriller

THE SKY IS A LIE. THE EDGE IS REAL. When a catastrophic disaster shuts down a remote hydroelectric dam in the Alaskan wilderness, investigative journalist Roy Rivera suspects more than structural failure. Classified images reveal armed blockades sealing the valley, while unmarked forces hunt anyone who survived. Inside the ruined facility, Roy finds Louis Ramirez, the dam’s former chief engineer, and evidence of an impossible discovery. Hundreds of feet beneath the mountain, excavation crews struck a seamless, indestructible barrier extending far beyond the reach of their instruments. With the help of Dr. Evelyn Howard, a blacklisted astrophysicist whose forbidden research destroyed her career, Roy uncovers a truth that challenges everything humanity believes about its world. The sky is manufactured. Earth is an artificial enclosure. And something beyond its walls has been watching. Pursued across the frozen wilderness by an elite mercenary strike team, Roy races to expose the secret before every witness is silenced. But as he closes in on the edge, he discovers the conspiracy may not have been created merely to control humanity. It may be the only thing keeping humanity alive. Now Roy must decide how much truth the world can survive before those guarding it erase him forever.

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