What Is The Old Dark House About?
The premise of The Old Dark House in 267 words, with nothing given away. The full story follows below.
Tom Penderel, an American car salesman living in London, finds his routine life upended when a simple errand strands him in a remote corner of the British countryside. Tasked with delivering a car to his eccentric roommate, Casper Femm, Tom arrives at a windswept Dartmoor mansion just as a ferocious storm breaks, damaging the vehicle and trapping him inside. The setting is a decaying estate that feels like a wound of wood and stone, perfectly suited for a “nut-house of terror” where the line between comedy and creepiness is razor-thin.
Within the gloomy walls, Tom is introduced to a gallery of unforgettable characters who make up the Femm family. There is Jasper Femm, the twin of the missing Casper, alongside cousins Cecily and Morgana Femm, and an uncle, Potiphar Femm, who is curiously occupied with building an ark for a prophesied flood. Each relative carries an air of mystery and eccentricity, transforming the mansion into a theater of the absurd. The house itself seems to pulse with the weight of old secrets, its creaking floorboards echoing the friction between the family members.
The atmosphere thickens as Tom learns of a strict family stipulation: every relative must return to the mansion before midnight each evening or forfeit their share of the family fortune. This rule creates a pressure chamber of suspicion and unease, ensuring that all the key players are confined together as the night wears on. With the storm raging outside and a series of fatal occurrences beginning to unfold, Tom must navigate this bizarre gathering to uncover what dark secrets the Old Dark House is hiding.
What Happens in The Old Dark House?
The complete story of The Old Dark House, from the first scene to the last, in 400 words (about 2 minutes). Spoilers throughout. Names in the text link to 6 cast member pages.
Spoilers ahead
Tom Penderel, an American car salesman in London, heads to a windswept Dartmoor mansion to deliver a car to his eccentric roommate Casper Femm. A ferocious storm rages outside, a statue crashes to the ground, and the car is damaged in the chaos. Inside the dim corridors, Tom discovers that Casper Femm is dead, setting a grim tone for what is to come within the decaying estate.
A fragile agreement forms as Tom is asked to stay with Casper’s scattered family. The group includes Casper’s twin brother Jasper Femm, his cousins—the demure Cecily Femm and the alluring Morgana Morgana Femm—and their uncle Potiphar Potiphar Femm, who has been busy building an ark in anticipation of another great flood. The house itself feels like a wound of wood and stone, its creaks echoing the old loyalties and rivalries that lie just beneath the surface as night begins to fall.
Each relative is bound to return to the mansion before midnight every evening, or else forfeit his share of the family fortune. The constraint twists the atmosphere into a pressure chamber where fear and suspicion take root. Over the hours, a death toll begins to rise. Agatha Femm, Casper’s mother, is found dead with knitting needles lodged in her neck, marking the first hour of dread. The next victim is Jasper Femm, followed by Roderick Femm, the stern head of the family, each disappearance tightening the grip of mystery around the remaining survivors.
Tom quickly realizes the killer is a woman, and his suspicions briefly settle on Morgana. Yet the truth begins to tilt toward Cecily, who is revealed to be the actual culprit just before she confesses, explaining that her motive was a greedy hunger for the entire estate. Cecily flees the house, and Tom pieces together the perilous puzzle, understanding that time itself is the weapon at play.
With the clock ticking, Tom uncovers time bombs hidden within the clocks scattered throughout the mansion. He races to defuse each device, the danger mounting with every passing moment. In a final burst of nerve and ingenuity, he hurls the last bomb out of a window, where it explodes at Cecily’s feet and ends the immediate threat. The storm rages on outside as the remaining relatives confront the aftermath, leaving a chilling reminder of greed, secrecy, and the fragility of family ties in a night where every hour brought a new horror.
The Old Dark House Timeline: Every Key Event in Order
11 key events in the order they happen, from “Delivery to the Dartmoor mansion during a storm” to “Final bomb hurled and explosion”. Every event takes place in Dartmoor mansion.
- 1
Delivery to the Dartmoor mansion during a storm
Tom Penderel, an American car salesman in London, delivers a car to the old Dartmoor mansion for his eccentric roommate Casper Femm. A raging storm knocks a statue loose, damaging the car, and Tom must enter the house where he discovers Casper dead.
Where:Dartmoor mansion
- 2
Invitation to stay with the Femm family
Tom is invited to stay at the mansion by Casper's relatives, including Jasper, Cecily, Morgana, and Uncle Potiphar. The house feels dilapidated and is filled with strange rituals, hinting at hidden motives beneath their polite facades.
Where:Dartmoor mansion
- 3
Midnight rule tightens the clock
The relatives insist that everyone must return to the mansion before midnight each evening or forfeit their share of the family fortune. The rule turns the night into a countdown as candles gutter and clocks tick ominously. The storm outside amplifies the sense of danger inside.
When:Midnight Where:Dartmoor mansion
- 4
First death: Agatha Femm
During the night, Agatha Femm is found with knitting needles embedded in her neck, a grim first victim. The murder sets a brutal pace for the remaining hours, and the family realizes the killer is not a stranger but someone within their circle.
When:Hour 1 Where:Dartmoor mansion
- 5
Second death: Jasper Femm
Casper's twin Jasper becomes the next victim, continuing the hourly toll. The deaths escalate the sense that a calculated killer is stalking the family from inside the mansion.
When:Hour 2 Where:Dartmoor mansion
- 6
Third death: Roderick Femm
Roderick, the head of the family, dies next, keeping the murderous pattern intact. Tom grows certain the danger is domestic, not a random intruder, as the horror unfolds throughout the night.
When:Hour 3 Where:Dartmoor mansion
- 7
Tom suspects Morgana
Tom stumbles upon the fact that the killer is a woman and initially suspects Morgana. The clue-driven investigation points toward the secret lives of the women in the house.
When:Hour 4 Where:Dartmoor mansion
- 8
Cecily's guilt revealed
Tom uncovers that Cecily is the killer just before she confesses, explaining that she wanted the entire family estate for herself. The motive reveals a calculated plot hidden beneath the family facade.
When:Hour 5 Where:Dartmoor mansion
- 9
Cecily runs and clocks become bombs
Cecily runs from the house, and Tom learns that she has planted time bombs in all of the clocks in the mansion. The building becomes a trap as ticking clocks threaten a catastrophe at every turn.
When:Hour 6 Where:Dartmoor mansion
- 10
Tom defuses the clock bombs
Tom frantically defuses the bombs, moving from clock to clock to prevent catastrophe. He races against time, trying to neutralize each device before the countdown hits zero.
When:Late night Where:Dartmoor mansion
- 11
Final bomb hurled and explosion
With moments to spare, Tom hurls the last bomb out of the window, and it explodes at Cecily's feet. The deadly plot is thwarted as the killer's plan collapses in the closing moments of the night.
When:Near midnight Where:Dartmoor mansion
Who Are the Main Characters in The Old Dark House?
10 characters, among them Caspar Femm (Peter Bull), Jasper Femm (Peter Bull) and Roderick Femm (Robert Morley): who each one is and the part they play in the story. Every profile links to the actor’s page.
-
Caspar Femm (Peter Bull)
Played by Peter Bull
An eccentric, enigmatic patriarch whose death at the outset triggers the night’s deadly sequence. His unclear plans and influence still loom over the family, guiding motives and suspicions even after death.
- 🗝️ Secret
- 💰 Wealth
- 🧩 Family
-
Jasper Femm (Peter Bull)
Played by Peter Bull
Caspar’s twin brother, part of the feuding clan, whose death marks the second stroke of the killer’s plan. He embodies the precarious balance of kinship and rivalry within the estate.
- 🗝️ Secret
- 💀 Death
- 🧩 Family
-
Roderick Femm (Robert Morley)
Played by Robert Morley
Head of the Femm family, stern and protective of the estate. His leadership is tested by a mysterious killer in the house and the escalating cost of maintaining the inheritance.
- 🗝️ Secret
- 🛡️ Power
- 💼 Wealth
- MF
Morgan Femm (Danny Green)
Played by Danny Green
A relative within the clan whose presence adds to the web of desire and suspicion. He navigates loyalties in a house where every motive is under scrutiny.
- 🎭 Drama
- 🗝️ Secret
- 🕵️ Investigation
- AF
Agatha Femm (Joyce Grenfell)
Played by Joyce Grenfell
Caspar’s mother, a figure of frailty and anxiety who becomes entangled in the family’s deadly schemes.
- 👵 Age
- 🗝️ Secret
- 🧵 Family
- MF
Morgana Femm (Fenella Fielding)
Played by Fenella Fielding
The seductive cousin whose presence stirs suspicion and desire, marking her as a central figure in the murder mystery.
- 🪄 Seduction
- 🕵️ Deception
- 💃 Charm
- TP
Tom Penderel (Tom Poston)
Played by Tom Poston
An American car salesman who becomes the outsider who suspects Morgana and uncover the truth by racing against time.
- 🕵️ Investigation
- 🚗 Travel
- 💪 Courage
- CF
Cecily Femm (Janette Scott)
Played by Janette Scott
A demure relative whose motive is revealed as she confesses—she orchestrates the clock-bomb plot to gain full control of the estate.
- 🎭 Drama
- 🗝️ Secret
- 💣 Bomb
- PF
Potiphar Femm (Mervyn Johns)
Played by Mervyn Johns
The Uncle, builder of an ark and a figure of eccentricity whose schemes add to the house’s dark atmosphere and danger.
- 🏗️ Architecture
- 🗝️ Secret
- 🪙 Wealth
- CR
Club Receptionist (John Harvey)
Played by John Harvey
A minor supporting character that adds to the social atmosphere and serves as background color within the mansion.
- 👔 Social
- 🕯️ Atmosphere
- 🗝️ Secret
Where and When Is The Old Dark House Set?
The Old Dark House is set in Dartmoor and London (One stormy night). Here is why the time and place matter to the story.
When
One stormy night
The events unfold over a single, storm-wracked night. The house is cut off from the outside world as a sequence of deaths tightens the net around the family. A ticking clock and sudden accusations escalate the tension, culminating in a desperate bid to defuse the bombs and uncover the truth.
Where
Dartmoor, London
The action centers on a dilapidated mansion on the Dartmoor moors, cut off by a raging storm. Inside, creaking corridors and decaying rooms host a family desperate to secure their fortune. Each evening the relatives must return to the house before midnight or lose their share, turning the mansion into a pressure cooker of secrets. The remote moorland setting emphasizes isolation and looming danger.
- 🏰 Mansion
- 🗺️ Moorland
- 🌧️ Stormy weather
What Are the Themes of The Old Dark House?
3 ideas the story keeps returning to, among them Greed & Inheritance, Mansion as Trap and Deception & Murder.
-
01
Greed & Inheritance
The pursuit of the family fortune drives lies, deception, and murder. Each relative is eager to secure a larger share, and Cecily’s confession lays bare the motive of sealing control over the estate. The film uses an inheritance plot to explore how wealth corrupts relationships and trust. The countdown of events reveals the perils of unchecked ambition.
-
02
Mansion as Trap
The old mansion is a claustrophobic stage where doors, clocks, and hidden compartments trap the characters. The storm outside mirrors the danger inside, with peril lurking in every room. As the clock ticks toward midnight, the house becomes a character in its own right, shaping actions and suspicions. The remote setting amplifies paranoia and the sense that no one can escape.
-
03
Deception & Murder
A web of secrets unravels as a killer moves among the family, initially suspected to be Morgana before Cecily ultimately confesses. The investigation is driven by Tom’s observations and the uncovering of murderous intent that has penetrated every layer of the family. The film explores gender dynamics and the ways appearances conceal motive. The climax hinges on deciphering truth from disguise as bombs and deadlines collide.
What Kind of Film Is The Old Dark House?
Tense in tone, with fast pacing and a moderate story, going by the plot summary.
- Tone
- Tense
- Pacing
- Fast
- Story
- Moderate
- Intensity
- High
- Ending
- Happy
A fast-paced, tense horror-comedy that traps viewers in an isolated mansion with a dysfunctional family during a raging storm, where murderous paranoia escalates into a frantic race against time.
- tense
- claustrophobic
- suspenseful
- eerie
- quirky
- murderous
- murder mystery
- inheritance
- dysfunctional family
- isolation
Content notes: murder, serial killer, bomb threat, dysfunctional family.
Quiz
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