What Is Submarine Alert About?
The premise of Submarine Alert in 327 words, with nothing given away. The full story follows below.
The Pacific coast in 1942 hums with the uneasy rhythm of war; merchant ships slice through fog‑laden waters while unseen signals flicker across the sky, hinting at a hidden battle of code and counter‑code. In this charged atmosphere, the United States government adopts a thin‑skinned, almost desperate strategy: it dismisses the region’s radio engineers and keeps a watchful eye on their movements, hoping the very act of unemployment will draw out those who might be coaxed into completing a dangerous piece of technology stolen by enemy agents.
The resulting tension spreads through neighborhoods of cramped workshops and bustling ports, where curiosity and caution mingle. Every cracked antenna and whispered conversation feels like a potential clue, and the world feels simultaneously ordinary and charged with a covert urgency. The mood is one of wary perseverance, a blend of patriotic resolve and the everyday grind of civilians caught in the currents of a global conflict.
At the heart of this uneasy landscape is Lew Deerhold, a talented engineer whose skill with short‑wave equipment is matched only by the personal stakes that drive him. He is haunted by the impending operation needed to save his ward Gina, a young soul whose fragile health adds a desperate urgency to his every decision. When an unexpected encounter introduces him to Ann Patterson, a perceptive woman with an innate sense for the undercurrents of the city, a tentative partnership forms—one built on mutual curiosity, shared purpose, and the quiet hope that personal integrity can survive the fog of espionage.
The film sustains a tight‑knit, suspense‑laden tone, marrying the stark realism of wartime industry with the shadowy allure of secret intelligence work. It invites the audience to sense the electric pull between ordinary lives and extraordinary threats, prompting a lingering question: in a world where every transmission could tip the balance of war, how far will a man go to protect the ones he loves and the nation that has become his reluctant home?
What Happens in Submarine Alert?
The complete story of Submarine Alert, from the first scene to the last, in 750 words (about 3 minutes). Spoilers throughout. Names in the text link to 8 cast member pages.
Spoilers ahead
During World War II, as submarines scour the Atlantic and American shipping comes under constant threat, an audacious plan unfolds to grind Nazi espionage to a halt. FBI agent G. B. Fleming Roger Pryor suspects that radio signals are tipping off German and Japanese forces to ship movements, and he proposes a sharp, disarming tactic: prune the pool of potential informants by firing all local radio specialists, then shadow the jobless to uncover who among them is secretly loyal to the enemy. The scheme hinges on catching traitors through their own hunger for work, and it sets the stage for a tense cat-and-mouse chase across a coast riddled with danger.
At the heart of the story is engineer Lewis J. “Lew” Deerhold Richard Arlen, a man wrestling with the sense that his own career has stalled because he is a Canadian citizen. Lew is devoted to his young niece Tina Patsy Nash, a war orphan who needs a life-saving brain operation, and this personal pressure pushes him to take chances he might otherwise avoid. Seeking work to support Tina, Lew lands at a radio repair shop where fate introduces him to Ann Patterson Wendy Barrie, a perceptive woman who has just helped someone in trouble after a purse snatching incident. The encounter sparks a cautious trust between them, and Ann’s instincts soon point her toward Lew as someone who could be more than just a neighbor or a neighborly repairman.
Lew’s new world collides with a shadowy conspiracy when his skeptical first impression meets the suave and dangerous Dr. Arthur Huneker Nils Asther and his cunning associate Vincent Bela Marc Lawrence. Huneker, a Nazi spy commander, needs someone with the technical skill to repair a top-secret stolen radio transmitter, and Lew’s expertise makes him a valuable — and dangerous — target. Ann, assigned to shadow Lew, discovers blueprints for the very transmitter in his possession, and when FBI agent Freddie Grayson Ralph Sanford arrives and is shot, the truth leaks out in a rush: Huneker and his cohorts have already laid their hands on the transmitter, and the clock is ticking.
The tension sharpens as the conspirators press Lew to join their cause. They attempt to recruit him in a chilling scene that also brings in Commander Toyo Abner Biberman, a Japanese officer who represents the other face of the alliance between the Nazis and the Japanese. The plot thickens when the group manipulates Bambridge, the owner of the Bambridge shipping company, with the disturbing revelation that Bambridge is really Captain Haigas, an American agent hidden behind a veneer of corporate respectability. The stakes rise as the newly recruited “traitor” in their midst rebels, managing to escape with the codes to the transmitter and the chance to turn the tables on his pursuers.
Lew and Ann refuse to abandon the fight. They slip away from Huneker’s clutches, but not before their pursuers tighten the net, eventually dragging them to a remote hot springs resort where they’re trapped in a steam room. The minute-by-minute danger escalates as Huneker and his minions move to finish the job—yet Lew, driven by a mix of duty, fear, and a stubborn sense of justice, engineers a clever countermeasure. He constructs a working transmitter while the heat of the room rises, and he sends out an SOS just as the steam threatens to seal their fate. The message is picked up by a diligent boy whose father immediately alerts the FBI, triggering a rapid, coordinated response.
The operatives closest to the case rally to save Lew and Ann, and in a swift culmination, Huneker and his network are arrested. Agent Fleming coordinates with a bomber squadron to neutralize the danger beyond the coast, destroying the Japanese submarine that had been waiting to strike off California. The immediate danger recedes, and the film closes on a note of cautious relief: Tina’s operation is successful, Lew’s aunt-like care for his family bears fruit, and, in a moving turn of events, Lew becomes a private in the U.S. Army and finally earns American citizenship, their small triumph echoing the larger war effort.
This story blends espionage, perseverance, and personal sacrifice into a tightly wound wartime thriller, where every action is a step toward protecting families, ships, and nations. The performances—anchored by Lew’s steadfast resolve, Ann’s conscientious skepticism, Huneker’s chilling menace, and the steadfast courage of those who stand against tyranny—deliver a narrative that stays true to its wartime roots while exploring the moral complexities of loyalty, identity, and sacrifice.
Submarine Alert Timeline: Every Key Event in Order
11 key events in the order they happen, from “FBI plan to flush out Nazi spies by firing radio workers” to “Lew becomes a US Army private and gains citizenship”. 11 events name a place, across 11 locations.
- 1
FBI plan to flush out Nazi spies by firing radio workers
During World War II, FBI agent Fleming believes German spies are tipped off by routine radio activity and proposes a ruse to identify them. He suggests firing all local radio specialists, hoping unemployed workers will seek any available job and reveal themselves. The plan sets the espionage hunt in motion and frames the conflict around radio technology.
When:World War II era Where:FBI headquarters
- 2
Lew Deerhold's family needs drive his job search
Lew Deerhold, a Canadian citizen, cares for his war orphaned niece Tina who needs a brain operation. He takes desperate steps to earn money and applies for work at a local radio repair shop. There he meets Ann Patterson, an FBI agent secretly following him, foreshadowing the larger conspiracy.
When:early film Where:Lew's home and the radio repair shop
- 3
Huneker offers a top-secret transmitter repair job
In Lew's apartment, Dr. Arthur Huneker and his assistant Vincent Bela present Lew with a job to repair a stolen, top-secret radio transmitter. Ann Patterson continues to shadow Lew as part of her FBI assignment. Freddie Grayson, another agent, searches Lew's place and is shot, yet he manages to warn that the doctor possesses the transmitter.
When:early to mid-film Where:Lew's apartment
- 4
Lew confronts Huneker and meets Toyo the Japanese commander
Lew confronts Huneker as he meets with Japanese Commander Toyo to recruit Lew into the Nazi operation. He pretends to cooperate while secretly plotting resistance. The tense exchange compounds the danger and deepens the espionage plot.
When:mid-film Where:Huneker's location
- 5
Torture plot against Bambridge; Lew escapes with transmitter codes
Huneker and Toyo begin torturing the owner of Bambridge Shipping to coerce cooperation. Lew is ordered to kill Bambridge, who is really American agent Captain Hargas. Lew escapes the scene with the transmitter codes, slipping out to continue the mission.
When:mid-film Where:Bambridge shipping company site
- 6
Lew and Ann are captured at the hot springs resort
Lew and Ann join forces to thwart the Nazi plot, but Huneker captures them and locks them in a steam room. Facing a deadly heat, Lew improvises a plan and begins to work on a transmitter to signal for help. The moment tightens the bond between the two protagonists amid danger.
When:mid-film Where:Doctor's hot springs resort steam room
- 7
SOS signal reaches the FBI via a boy and his father
From the steam room, Lew devises a makeshift transmitter and sends an SOS. A young boy picks up the distress signal and his father immediately calls the FBI. The inadvertent transmission becomes the critical link that triggers a rescue operation.
When:mid to late film Where:steam room, hot springs resort
- 8
FBI moves in and captures Huneker and his men
Agents rush to Lew and Ann's location and arrest Huneker and his accomplices. Fleming coordinates the crackdown, eliminating the immediate Nazi threat in the area. The arrests restore some stability and reveal the extent of the network.
When:climax Where:hot springs resort vicinity
- 9
Bomber squadron destroys the Japanese submarine off California
Agent Fleming contacts a bomber squadron that targets the Japanese submarine lurking off the California coast. The decisive air strike protects shipping lanes and demonstrates effective cooperation between intelligence and military power. The action underscores the broader war effort of the home front.
When:final act Where:California coast
- 10
Tina's operation is successful and the family reunion
With Tina recovered from her brain operation, she is present for the victory moment and relief. The success brightens the atmosphere and confirms the personal stakes behind the espionage mission. The family reunion scene emphasizes the human cost and reward of the war effort.
When:ending Where:Lew's home
- 11
Lew becomes a US Army private and gains citizenship
In the film's closing arc, Lew is granted American citizenship and serves as a private in the US Army. Ann attends the moment, highlighting their ongoing partnership in service to the country. The culmination ties Lew's personal triumph to his renewed national allegiance.
When:ending Where:United States military setting
Who Are the Main Characters in Submarine Alert?
7 characters, among them Lewis J. 'Lew' Deerhold — Richard Arlen, Ann Patterson — Wendy Barrie and Dr. Arthur Huneker — Nils Asther: who each one is and the part they play in the story. Every profile links to the actor’s page.
- LJ
Lewis J. 'Lew' Deerhold — Richard Arlen
Played by Richard Arlen
A Canadian citizen who fears losing his job, Lew looks after his war-orphan niece Tina. He accepts work at a radio repair shop, where he becomes entangled with Nazi operatives after obtaining blueprints for a stolen transmitter. Resourceful and protective, he outsmarts his pursuers, helps recover the transmitter codes, and ultimately becomes a U.S. Army private who earns American citizenship.
- 🧭 Resourceful
- 👨👧 Family-focused
- 💡 Inventive
- AP
Ann Patterson — Wendy Barrie
Played by Wendy Barrie
An FBI agent assigned to follow Lew under cover. She uncovers the transmitter blueprints and uses her undercover position to feed critical information to the FBI. Brave and capable, she fights alongside Lew and risks her life to thwart the spy ring.
- 🕵️ Detective
- 🤝 Loyal
- 🎯 Focused
- DA
Dr. Arthur Huneker — Nils Asther
Played by Nils Asther
A Nazi spy commander working with Bela and Toyo, he is smooth-talking yet ruthless. He entices Lew to join the Nazi cause and tortures captives to extract information. His pursuit of a top-secret transmitter drives much of the intrigue before he is finally arrested.
- 🧠 Scheming
- 🤥 Deceptive
- 🗡️ Ruthless
-
Vincent Bela — Marc Lawrence
Played by Marc Lawrence
Huneker’s cunning associate and key conduit for the spy operation. Bela maneuvers within the conspiracy and remains willing to push Lew toward betrayal to protect the mission. His duplicity keeps the plot’s tension high as loyalties blur.
- 🤝 Collaborator
- 🧪 Cunning
- 🕴️ Shadowy
- GB
G. B. Fleming — Roger Pryor
Played by Roger Pryor
An FBI agent who engineers the plan to fire local radio specialists to flush out Nazi sympathizers. He coordinates operations with bomber squads and plays a pivotal role in coordinating Lew and Ann’s counter-espionage efforts.
- 🕵️ Leader
- 🎯 Strategist
- MB
Mr. Bambridge / Capt. Haigas — John Miljan
Played by John Miljan
Owner of the Bambridge Shipping Company, a figure who becomes entangled in the espionage plot through his corporate position and dual roles. His authority is leveraged by the conspirators, and he ultimately becomes a target for arrest as the plot unfolds.
- 🧭 Industrialist
- 🎭 Double-agent
- CT
Commander Toyo — Abner Biberman
Played by Abner Biberman
A Japanese commander who meets with Huneker to pressure Lew and coordinate espionage efforts. He embodies the external wartime threat and represents the international dimension of the home-front conflict.
- 🗡️ Opponent
- 🧭 Spymaster
Where and When Is Submarine Alert Set?
Submarine Alert is set in California coast, radio repair shop, hot springs resort and Bambridge Shipping… (World War II era). Here is why the time and place matter to the story.
When
World War II era
Set during World War II, the film depicts submarine threats off the American coast and the FBI’s intensified anti-spy efforts. The period shapes the urgency of job searches, covert surveillance, and the race to safeguard crucial communications and shipping lanes. Citizens rally around national security as espionage networks unfold on the home front.
Where
California coast, radio repair shop, hot springs resort, Bambridge Shipping Company offices
The action moves along the foggy California coast, between a modest radio repair shop, a secluded hot springs resort, and the bustling offices of a shipping company. These locations anchor the wartime espionage plot, contrasting everyday civilian life with undercover operations. The settings convey a home-front environment where danger hides behind ordinary routines.
- 🌊 Coastal settings
- 🏭 Industrial locations
- 🏝️ Resort areas
What Are the Themes of Submarine Alert?
3 ideas the story keeps returning to, among them Espionage, Patriotism and Courage.
-
01
Espionage
The movie centers on counter-espionage as the FBI improvises strategies to uncover Nazi and Japanese agents. It highlights deception, informants, and strategic surveillance as tools to prevent intelligence leaks. The plan to fire local radio specialists to expose sympathizers showcases the high-stakes cat-and-mouse game at the heart of wartime security.
-
02
Patriotism
A core thread is loyalty to country and the willingness to sacrifice for the greater good. Lew’s journey toward U.S. citizenship after serving reflects personal commitment to his adopted homeland. The story ties personal sacrifice to the broader war effort on the home front.
-
03
Courage
Characters confront life-threatening danger, from torture to high-stakes escapes. They improvise under pressure, build critical devices, and persist in the face of intimidation. The film emphasizes resilience and moral resolve as essential weapons against infiltration and subversion.
What Kind of Film Is Submarine Alert?
Tense in tone, with fast pacing and a straightforward story, going by the plot summary.
- Tone
- Tense
- Pacing
- Fast
- Story
- Straightforward
- Intensity
- High
- Ending
- Happy
A fast-paced, high-stakes wartime thriller that sustains constant tension through perilous chases and life-or-death espionage, balanced by a patriotic, hopeful resolution.
- tense
- urgent
- patriotic
- suspenseful
- dangerous
- hopeful
- espionage
- world war ii
- patriotic duty
- undercover investigation
Content notes: war violence, aerial bombing, villain commits suicide, child endangerment.
Quiz
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Where to Watch Submarine Alert
Stream it on Cineverse and Fawesome, or rent or buy it from FlixFling. US availability and prices from JustWatch.
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