What Is Devil’s Diary About?
The premise of Devil’s Diary in 324 words, with nothing given away. The full story follows below.
In a quiet, pine‑lined town where everyone knows each other’s birthdays, the discovery of an ancient, unmarked volume in a forgotten graveyard shatters the comforting rhythm of everyday life. The book, known locally as the Devil’s Diary, is rumored to give shape to the darkest thoughts of anyone who dares to write within its pages. Its presence turns the sleepy streets into a place where whisper‑thin fear hangs heavy in the air, and the line between imagination and reality begins to blur. The film’s atmosphere leans toward a brooding, almost gothic thriller, letting the unease seep through muted colors, lingering shadows, and the ever‑present rustle of autumn leaves.
Dominique and Ursula are two teenagers bound by a friendship that oscillates between fierce loyalty and the restless yearning for power that the diary seems to promise. Dominique, thoughtful and wary, serves as the moral anchor, while Ursula, bold and increasingly curious, is drawn to the allure of control. Their world is further complicated by the social hierarchy of high school, embodied by a popular cheerleading circle that includes Heather and her boyfriend Kyle, whose presence adds a constant undercurrent of rivalry and expectation. Meanwhile, Father Mulligan, the small‑town minister, offers a voice of caution and a glimpse of the town’s deeper, lingering superstitions, hinting at a hidden history that the community has long tried to forget.
As the teens grapple with the temptation of the diary’s forbidden power, the town itself becomes a character—its tightly knit community, aging churches, and hushed local legends all conspiring to heighten the tension. The narrative drifts between moments of quiet introspection and sudden, unsettling bursts of supernatural dread, inviting the audience to wonder how far ordinary people will go when confronted with a force that can turn thoughts into reality. The story sets the stage for a clash between youthful ambition and an ancient darkness, promising a haunting exploration of how desire can corrupt even the most familiar places.
What Happens in Devil’s Diary?
The complete story of Devil’s Diary, from the first scene to the last, in 741 words (about 3 minutes). Spoilers throughout. Names in the text link to 5 cast member pages.
Spoilers ahead
One night, two teenage friends Dominique and Ursula wander a shadowed graveyard, drawn to a toppled tombstone where a flash of lightning reveals a pale, blank book tucked inside the soil. The book, as they soon discover, holds a sinister promise: it grants power to those who write in it, but at the cost of the writer’s soul. Ursula pockets the mysterious volume, convinced that fate dragged her to this dangerous find, while the world around them—bullied by a group of cheerleaders named Heather, Georgia, and Lisa—seems ready to grind them down.
The trouble begins almost at once. Ursula, emboldened by the find, whispers a cruel wish into the book, setting Heather’s world on edge as harm descends upon her. Heather’s legs are broken in two terrifying car incidents, a shocking “freak accident” that leaves the school community reeling. Despite the evidence, Heather’s friends and the townspeople remain wary, and Ursula’s grip on the book only tightens. The power to shape fate tempts the two girls to press further, while the consequences creep closer to those they care about most.
In the midst of fear and doubt, Ursula targets Heather’s boyfriend, Kyle, and a dangerous line is crossed: during a Chemistry class exam, a corrosive liquid burns and blistered his face after a fall, signaling that the book’s reach is broader and more personal than anyone anticipated. The pair’s dynamic grows darker as the book’s pages fill with an ominous Latin title—Ephemeris Diaboli—signaling that the relic is no ordinary tool but a doorway to something far older and more dangerous. Dominique, troubled by the chaos, urges Ursula to abandon the book and seek help, but Ursula’s hold on the power is hard to break.
As the danger escalates, Lisa overhears their confrontation, and the two girls dig deeper into the artifact’s history. Research reveals the book’s English alias, the Devil’s Diary, and its disturbing reputation: the kind of object that only seeks out the ambitious and corrupts those who dare to wield it. At Heather’s hospital bedside, Georgia and Lisa disclose what they know about Ursula and the book, heightening the sense that loyalty and betrayal are as lethal as any supernatural force.
Desperate for guidance, Dominique seeks counsel from a church minister, Father Mulligan, who warns that the ancient book is crafted by the Devil and can manifest the worst impulses in people. He advises that Ursula must be kept away from the relic, yet skepticism lingers about whether the book’s evil is truly real or just a chilling myth. Undeterred, Ursula presses on, drawing closer to darkness with every cruel act.
The book’s influence intensifies as its hold over Heather’s circle grows. Heather’s friends steal it back from Ursula, and a cruel chain of vengeance unfolds: Heather forces Georgia to write a cruel inscription that leads to Ursula’s teeth, hair, and vitality being erased by a brutal, deadly fate. Georgia herself betrays Heather, setting up a tragic accident that ends Heather’s life in a hospital. Georgia’s betrayal extends further when she manipulates Lisa into a fatal electrocution via a malfunctioning stage light.
Retaliation spirals as Dominique retrieves the book, tearing out pages and hurling them against a wall, watching Georgia strike her head and die from the impact. The toll of the book’s power weighs heavily on Dominique, who is soon beset by trauma: an unsettling sense of what she’s become and what she’s chosen to do in its name. When Dominique faces the darker parts of herself—culminating in a brutal moment with her sexually abusive stepfather—she writes again in the book, hoping for his demise.
The power-hungry Frank enters the story in a new, perilous way, and the consequences spiral even farther. Dominique brings the book to [Father Mulligan], who refuses to safely contain it, and another would-be collector, Father Sanchez, asserts a more dangerous hunger for the relic. His arrival ushers in a catastrophic confrontation in which the book consumes him in flames, as if the flames themselves were a manifestation of the demonized power contained within.
In the wake of these horrors, Dominique is left reeling, bound for a psychiatric hospital six weeks later as she contends with the memories and the weight of the book’s influence. A grim vision closes the tale: two boys uncover and lift the book from a graveyard resting place, a clear reminder that the cycle could begin again, trapping another soul in the same cycle of power, violence, and despair.
Devil’s Diary Timeline: Every Key Event in Order
15 key events in the order they happen, from “Discovery of the cursed book in the graveyard” to “Six weeks later: a haunted conclusion”. 15 events name a place, across 13 locations.
- 1
Discovery of the cursed book in the graveyard
During a late-night wander in a graveyard, Dominique and Ursula witness a lightning strike that blasts a tombstone. They discover a mysterious, blank book with a message promising power in exchange for a soul. This encounter marks the beginning of the book's dark influence.
When:Night Where:Graveyard
- 2
Ursula tests the book's power on Heather
Ursula becomes convinced the find was fate and begins to experiment with the book's power. She writes a command aimed at Heather, hoping to cripple her. Dominique remains skeptical, warning that the book may corrupt them.
When:Same night as discovery Where:Ursula's room
- 3
Heather's legs are broken in a freak accident
Shortly after Ursula's initial use, Heather's legs are broken in a seemingly freak accident where two cars strike her. The incident appears to be a direct consequence of Ursula's wishes rather than mere bad luck. The town buzzes with fear as the consequences of the book become real.
When:Next day Where:Town street
- 4
Kyle is burned in a Chemistry class
In another display of the book's reach, Kyle's face is burned and blistered during a Chemistry class after Ursula's manipulation. It becomes clear the book's power targets those Ursula dislikes.
When:During class Where:School - Chemistry class
- 5
The book reveals its ominous Latin name Ephemeris Diaboli
The book's power deepens as it reveals its ominous Latin name Ephemeris Diaboli. Dominique and Ursula debate whether it is real and warn that it requires a willing target to work. The artifact's true nature grows more terrifying.
When:Shortly after Where:Room
- 6
Dominique seeks help from Father Mulligan
Disturbed by the escalating harm, Dominique seeks help from Father Mark Mulligan at a local church. The priest is doubtful but warns that the book may be crafted by the Devil and urges Dominique to distance herself.
When:Afternoon Where:Church
- 7
Heather's friends steal the book; Ursula's fate is sealed
Heather's friends steal the book from Ursula, hoping to test its power for themselves. The theft escalates the danger and the bond between the book's dark force and those who possess it tightens its grip.
When:A few days later Where:School hallway
- 8
Georgia manipulates the book to end Ursula
Heather manipulates Georgia to write in the book a curse that would cause Ursula to lose her teeth, hair, and choke on her own vomit, resulting in Ursula's death. The act marks a turning point as the book's influence spreads.
When:Shortly after the theft Where:Georgia's location
- 9
Heather dies after a cruel betrayal
Georgia betrays Heather by writing to have her killed in a tragic accident. Heather dies in the hospital when a cord strangles her, underscoring the deadly consequences of the book's power.
When:Not long after Where:Hospital
- 10
Lisa is electrocuted during a confrontation
Lisa is electrocuted and killed by a stage light after betraying Heather. The brutal event demonstrates the book's reach into the lives of everyone around them.
When:Soon after Heather's death Where:Stage/backstage area
Show the other 5 events of Devil’s Diary Hide the last 5 events
- 11
Dominique retrieves the book and it costs Georgia
Dominique retrieves the book, rips out pages, and tosses it against a wall in a desperate attempt to end its influence. Georgia is slammed by the impact and dies from the head injury that follows.
When:Shortly after Where:Indoor location
- 12
Dominique faces abuse and seeks power in the book
Dominique is attacked by her sexually abusive stepfather, and in desperation writes a new wish in the book hoping he dies. The chaos deepens as Frank stabs himself with a pair of scissors, leaving Dominique to mourn the possibility that she has sold her soul to the book.
When:Sometime after the head injury incident Where:Dominique's home
- 13
Mulligan refuses the book; Sanchez moves in
Dominique brings the book to Father Mulligan, who refuses to take it, warning of its danger. Father Sanchez, sensing opportunity, expresses more ambition and takes the book for himself, drawn to its power.
When:After the stepfather incident Where:Church
- 14
The clash of power ends in tragedy
Father Sanchez punishes Mulligan and tries to coerce Dominique to kill him to consummate their alliance. Instead, Dominique manages to wreck the book, and Sanchez dies in flames that engulf him.
When:Following Sanchez's take of the book Where:Church
- 15
Six weeks later: a haunted conclusion
Six weeks later, Dominique is in a psychiatric hospital for obsessing over the book. She has a vision of two boys finding and taking the book that had been buried in a graveyard, triggering her fear that the cycle will begin again.
When:Six weeks later Where:Psychiatric hospital
Who Are the Main Characters in Devil’s Diary?
9 characters, among them Dominique (played by Alexz Johnson), Ursula Wilson (played by Magda Apanowicz) and Heather (played by Miriam McDonald): who each one is and the part they play in the story. Every profile links to the actor’s page.
- D(
Dominique (played by Alexz Johnson)
Played by Alexz Johnson
Dominique is a practical, protective teen whose life is marked by her mother's absence and a late father she still visits. She grapples with the book’s lure while trying to shield Ursula from its harm. Her resolve to stop the nightmare drives her to seek help from Father Mulligan, even as tragedy mounts. By the end, she finds herself haunted by what happened and fears the cycle may begin again.
- 🎯 Protagonist
- 🧭 Reluctant Leader
- 💪 Determined
- UW
Ursula Wilson (played by Magda Apanowicz)
Played by Magda Apanowicz
Ursula is ambitious and increasingly diabolical as the book magnifies her desires for power. She becomes the catalyst for the book’s spread of harm, dismissing concerns and rationalizing every cruel act. Her descent showcases how easily temptation can corrupt even those who start with noble intentions. Her arc ends with a fatal confrontation that underscores the book’s deadly grip.
- 🔥 Ambitious
- ⚡ Power-hungry
- 🧪 Dangerous
- H(
Heather (played by Miriam McDonald)
Played by Miriam McDonald
Heather is a popular cheerleader who participates in the cruel social dynamics around Dominique and Ursula. She experiences the consequences of the book’s power as her life spirals into violent incidents. Her arc shifts from a figure of social control to a vulnerable casualty of the unfolding horror. Her fate underscores the real-world stakes of bullying and retaliation.
- 👯♀️ Popular
- 🎗️ Bully
- 💔 Victim
- K(
Kyle (played by Aleks Holtz)
Played by Aleks Holtz
Kyle is Heather’s boyfriend and a focal point of Ursula’s early schemes. He becomes a target of the book’s malicious effects, witnessing the harm inflicted in class and beyond. His injuries symbolize the tangible, physical consequences of the supernatural conflict. Kyle’s arc demonstrates how collateral victims are drawn into the spiral of vengeance.
- 💔 Love interest
- ⚠️ Target
- 🏫 Student
- G(
Georgia (played by Deanna Casaluce)
Played by Deanna Casaluce
Georgia is a friend whose actions reveal the treacherous side of loyalty. She betrays Heather and becomes entangled in the book’s deadly plots, contributing to the tightening grip of violence. Her choices illustrate how trust fractures under the influence of fear and power. Georgia’s arc heightens the sense of danger surrounding the group.
- 🤫 Betrayer
- 🧊 Complicit
- 🌀 Ambiguous Ally
- L(
Lisa (played by Laura Carswell)
Played by Laura Carswell
Lisa is an eavesdropper who becomes complicit through overheard plans and wrong assumptions. Her actions—and eventual fate—demonstrate how information and betrayal propagate harm. She illustrates the precarious position of bystanders in a crisis driven by supernatural consequences.
- 👀 Observer
- 🗡️ Silent Ally
- 🌫️ Shadow
- F(
Frank (played by Jason Calder)
Played by Jason Calder
Frank is Dominique’s sexually abusive stepfather, a source of danger in her home life. His presence adds a personal horror element to the story, culminating in self-inflicted harm that echoes the book’s destructive power. His arc contributes to Dominique’s desperation and moral conflict.
- 👤 Abuser
- 🗡️ Tragic
- FM
Father Mulligan (played by Brian Krause)
Played by Brian Krause
Father Mulligan is the cautious church minister who doubts the book’s reality but urges Dominique to keep away from it. He represents a voice of reason and moral concern amid escalating horror. His stance underscores the theme of discernment in the face of temptation.
- 🙏 Clergy
- 🛑 Skeptical
- 🗝️ Gatekeeper
- FS
Father Sanchez (played by Pablo Coffey)
Played by Pablo Coffey
Father Sanchez is the more ambitious cleric who seeks the book’s power for himself. He ultimately succumbs to the book, dying in flames and triggering further chaos. His arc emphasizes how the pursuit of forbidden power leads to doom for those who chase it.
- 🔥 Fatalist
- ⚖️ Ambitious
Where and When Is Devil’s Diary Set?
Devil’s Diary is set in graveyard, hospital, church and high school. Here is why the place matters to the story.
When
Set in contemporary times, the narrative unfolds with modern teen life, including school, medical visits, and religious institutions. The sequence of events occurs over nights of danger and escalating incidents that ripple through everyday places. The tone blends mundane teenage routines with supernatural horror.
Where
graveyard, hospital, church, high school
The graveyard is where Dominique and Ursula first discover the blank book. The story then moves through hospital visits and church settings as the supernatural consequences unfold. The high school environment provides the backdrop for bullying, exams, and teen dynamics that drive the plot.
- 🕯️ Graveyard
- 🏥 Hospital
- ⛪ Church
- 🏫 High School
What Are the Themes of Devil’s Diary?
4 ideas the story keeps returning to, among them Temptation, Bullying and Power and Consequence.
-
01
Temptation
A mysterious book offers immense power in exchange for a soul, drawing characters toward dangerous choices. Ursula eagerly wields its potential, while Dominique remains wary of the price. The theme explores how the lure of control can corrupt judgment and erode moral boundaries. The book’s allure reveals the fragility of human restraint when faced with fear and ambition.
-
02
Bullying
The story centers on a hostile social dynamic where Dominique and Ursula are tormented by cheerleaders. The bullying intensifies into dangerous acts as the book empowers aggression. Allies and bystanders become entangled in the violence, highlighting the brutal social costs. The narrative shows how cruelty can catalyze drastic, even fatal, reactions.
-
03
Power and Consequence
Power granted by the occult book corrupts quickly, transforming friendships into threats and trust into betrayal. Characters chase results that exceed their control, paying with harm and ruin. The escalating punishments demonstrate the inescapable costs of wielding forbidden force. The cycle of vengeance unfolds across multiple victims, feeding a self-perpetuating nightmare.
-
04
Redemption
Dominique seeks refuge and guidance from a church minister, hoping to sever the book’s hold and save those around her. Even as the cycle spirals toward tragedy, there is a glimmer of desire for mercy and restoration. The ending, with Dominique in a psychiatric hospital and the fear of a new cycle, suggests that redemption remains possible but fragile.
What Kind of Film Is Devil’s Diary?
Dark in tone, with fast pacing and a straightforward story, going by the plot summary.
- Tone
- Dark
- Pacing
- Fast
- Story
- Straightforward
- Intensity
- High
- Ending
- Bleak
A fast-paced and sinister teen horror film that creates an anxious, oppressive atmosphere as a cursed diary corrupts a group of high school students, leading to a grim chain of violent retribution and moral decay.
- sinister
- anxious
- oppressive
- violent
- grim
- retributive
- supernatural horror
- teen corruption
- revenge
- good versus evil
Content notes: attempted rape, abusive stepfather, acid attack, fatal accidents, child endangerment.
Quiz
How well do you remember Devil’s Diary? Test yourself on the story.
Where to Watch Devil’s Diary
Stream it on fuboTV and Plex, or rent or buy it from Fandango At Home. US availability and prices from JustWatch.
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