In Secret

In Short

Published in 1919, In Secret is a high-stakes World War I espionage thriller following Evelyn Erith, a gifted cipher expert for the United States Intelligence Department, and Kay McKay, a disgraced former prisoner of war who holds the key to a catastrophic German military plot. Together, they embark on a dangerous covert mission across Scotland, the Swiss border, and into the treacherous alpine wilderness of Mount Terrible. Robert W. Chambers crafts a fast-paced narrative of survival, devotion, and wartime intrigue that endures for its tense wilderness set-pieces and its sincere, character-driven romantic core.

The Story

The narrative begins in New York City within the heavily guarded offices of the American intelligence network. Evelyn Erith, an exceptionally talented cryptanalyst, intercepts and breaks a intercepted cipher mailed from Mexico. The decrypted message reveals that the Imperial German High Command is hunting a man named Kay McKay. McKay, an American who escaped the brutal Holzminden prisoner-of-war camp in Germany, possesses knowledge of the "Great Secret"—a covert military operation so sensitive that its exposure threatens the entire German war effort. To keep McKay silent, German agents systematically drove him to severe alcoholism during his captivity.

Evelyn locates McKay drifting through New York, broken in body and spirit. Recognizing his underlying integrity, she rescues him, secures medical treatment for his addiction, and recruits him for a dangerous field assignment. McKay recovers his health and vows to complete his duty. Together, they join the Army Intelligence Department and travel under cover to McKay's ancestral estate in Scotland to prepare for their deployment into neutral Switzerland. While on the Scottish moors, German operatives track them down, forcing McKay and Evelyn into a deadly night-time firefight at Isla Craig, where they narrowly escape by swimming cold waters.

Crossing into the borderlands near Mount Terrible, the duo coordinates with Recklow, a senior intelligence operative based in France. Their mission requires them to traverse the alpine wilderness of Les Errues, a desolate region heavily patrolled by German forces and traitors. They encounter harrowing obstacles, including enemy aircraft patrols, hostile wilderness conditions, and betrayal within their own networks. In one desperate turn, Evelyn and McKay send critical intelligence and Sir W. Blint's papers back to England using Manitou, a wild bald eagle that belonged to a fallen British aviator.

As they press deeper into the mountain passes, they are hunted down by Prussian patrols. Suffering from poisoned water sources and sheer physical exhaustion, McKay cleverly fakes their deaths by staging a desperate trail that leads off a sheer precipice, abandoning their heavy gear and empty cartridge belts to mislead their pursuers. A brutal encounter with a Prussian soldier near an isolated river cabin nearly costs Evelyn her life, but McKay intervenes in time, killing the enemy and carrying her to safety.

Having successfully infiltrated the enemy’s hidden subterranean complex beneath Mount Terrible, they deliver the vital intelligence to Allied Command. Their reports allow Marshal Foch and Allied forces to neutralize the underground German installation—a massive subterranean facility housing thousands of troops—effectively sealing the threat. Returning to a peaceful French garden in September, McKay and Evelyn reflect on the devastating human cost of the conflict, find healing in each other's love, and prepare for their future together in Paris as the war draws to its end.

How It Unfolds

The intercepted cipher Evelyn Erith deciphers a yellow-envelope letter mailed from Mexico, uncovering a German plot to assassinate Kay McKay, an escaped prisoner who knows a critical military secret.

A rescue in the snow Evelyn finds McKay severely incapacitated by alcoholism on a freezing New York night, saves his life, and convinces him to enter a hospital to recover and volunteer for intelligence service.

Ambush on the Scottish moors While preparing for overseas duty at McKay's Scottish estate, the pair is surrounded by German agents at Isla Craig and must fight their way out under cover of darkness.

Crossing the Swiss border Recklow guides the duo through hidden mountain paths into the neutral yet dangerous wilderness surrounding Mount Terrible, where enemy patrols constantly roam.

The messenger in the sky Evelyn uses a golden whistle to summon Manitou, a dead aviator's eagle, attaching secret reports and maps to its wings so it can fly the intelligence back to England.

Faking a fatal drop Hunted and suffering from poisoned water, McKay stages a fake trail ending at a steep chasm, convincing the German pursuers that he and Evelyn have fallen to their deaths.

A desperate struggle at the cabin Evelyn is cornered by an aggressive Prussian soldier near a wilderness river; McKay arrives just in time, eliminates the soldier, and secures a shelter where they can recover.

The final reckoning Their reports lead to the destruction of the subterranean German stronghold beneath Mount Terrible, after which Evelyn and McKay reunite in a quiet French garden to plan their life together.

The People

• Evelyn Erith is a brilliant, determined American cipher expert who yearns to contribute directly to the war effort in France. Driven by a deep sense of duty and compassion, she rescues McKay from self-destruction, stands by him through mortal danger in the field, and ultimately transforms from his field companion into his devoted romantic partner.
• Kay McKay is a courageous American intelligence agent who was subjected to psychological torture and forced alcoholism while imprisoned at Holzminden. Driven by a desire to rehabilitate his honor and protect the "Great Secret," he fights through physical trauma and addiction to become a formidable, protective operative who repeatedly risks his life to save Evelyn.
• Recklow is a calm, pragmatic senior spymaster operating along the Franco-Swiss border. He provides crucial tactical advice, supply drops, and strategic guidance, serving as the steady anchor for Evelyn and McKay's dangerous covert operations.
• Harry Skelton is a compromised, conflicted agent operating in the border regions whose entanglements with German operatives lead to tragic betrayals along the mountain passes.

In Its Own Voice

"Fate had taken charge of that yellow envelope from the moment it was mailed in Mexico; Chance now laid it on a yellow oak table before a yellow-haired girl; Destiny squinted over her shoulder as she drew the letter from its triply violated envelope and spread it out on the table before her." — An opening window into the intelligence office where Evelyn Erith intercepts the secret German dispatch.

"And now, here in this ancient garden--here in the sun of earliest summer, she had beheld a transfiguration." — Evelyn observes Kay McKay's physical and spiritual recovery while resting in Scotland.

"Down through the tree-tops sheered the huge bird, the air shrilling through his pinions, and struck the solid ground and set his yellow claws in it, grasping the soil of the Old World with mighty talons." — The dramatic arrival of Manitou, the war eagle used to carry intelligence across the border.

What It's Really About

Beneath its pulse-pounding espionage plot, In Secret explores themes of redemption, endurance, and the psychological scars inflicted by modern warfare. Kay McKay’s struggle is not merely against German soldiers, but against the chemical addiction forced upon him during his imprisonment. His recovery highlights the novel's belief in human resilience when supported by empathy and trust. Furthermore, the book contrasts the serene, enduring beauty of the natural world—the Scottish moors and the alpine forests—with the unnatural cruelty and subterranean horrors of wartime industry. Chambers examines how love and moral clarity can survive and flourish even when individuals are surrounded by total war.

Why Read It Today

In Secret offers a vivid, fast-paced glimpse into World War I popular fiction, blending classic espionage tropes with wilderness survival. Readers who enjoy classic adventure novels, historical spy fiction, and romantic suspense will appreciate its tense action sequences, from night battles on foggy moors to desperate mountain evasions.

The reading experience is swift and energetic, defined by dramatic dialogue and vivid atmospheric descriptions of mountain landscapes. Modern readers should be prepared for period-specific elements typical of 1919 wartime literature: intense patriotic sentiment, straightforward melodramatic beats, and harsh, unvarnished depictions of enemy forces reflecting the wartime era in which it was written.

What lingers long after finishing the book is the grounded relationship between Evelyn and McKay. Their bond evolves naturally from mutual professional respect to deep emotional reliance forged through shared danger. In Secret stands out as an engaging time capsule of early twentieth-century spy adventure, delivered with sincere emotion and crisp narrative drive.