Vague Visages’ Undertone review contains minor spoilers. Ian Tuason’s 2025 movie features Nina Kiri, Adam DiMarco and Michèle Duquet. Check out the VV home page for more film criticism, movie reviews and film essays.
Sound design is paramount in horror. Without it, things that go bump in the night simply won’t. Creative sound design can make a great movie truly legendary. Consider Blair Witch (2016), whose unique and expertly constructed soundscapes took it from a throwaway requel to a nightmare-inducing must-watch. Undertone, the feature debut from Canadian writer-director Ian Tuason, is being marketed as “the scariest movie you’ll ever hear,” which is a gamble considering genre cinema is built on terrifying imagery. Although that pull-quote might put off snooty hardcore fans, it genuinely might be true.
Undertone’s action is confined to a single location — the dated childhood home in which Evy (Nina Kiri, phenomenal) watches her elderly mother (Michèle Duquet as Mama) slowly fade away in real time. While trying to keep the dying woman alive, the protagonist records a creepypasta-themed podcast with Justin (Adam DiMarco), who lives across the pond in London. Because of the time difference, the duo typically records at 3 a.m. aka “the witching hour.” Given their subject matter, it’s unsurprising that Justin, whom Evy snarks is a “Santa Claus believer,” frequently gets creeped out. His co-host, a proud skeptic, is much harder to shake.
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That all changes when Justin receives a mysterious email containing 10 audio clips of an expectant young couple going through some kind of demonic possession. Evy instantly dismisses it as a hoax, even as spooky things also start happening to her. But, as they listen to each one, it gradually becomes impossible to deny that something very strange is going on. Fortunately, the experience of listening to these 10 little snippets of a life being shared by two people who, like Justin, never appear onscreen, isn’t a slog. Demonic possession is a total cliché at this point, but Tuason puts a nasty twist on it by focusing on a particularly horrible ghoul who targets pregnant people and new mothers, with the intention of killing them and their babies (trigger warning for any parents planning to watch).
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As a result, Undertone never feels hokey or derivative. By focusing almost entirely on Evy, Tuason takes a massive risk. Indeed, for most of the movie, she’s the only character onscreen, with Mama, as she’s billed, unresponsive upstairs in bed. The first-time filmmaker consistently draws eyes to the dark, empty spaces behind Evy — particularly an empty doorway that feels like it’s encroaching upon her — as she records with Justin, the camera creeping around corners or simply hanging around back there, as though somebody is always watching. And yet, nothing happens when one expects it to, which only adds to the unnerving atmosphere and increasingly excruciating tension. Shots are frequently tilted at bizarre angles, which adds to the impression that everything is slightly off kilter.
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Likewise, Graham Beasley’s evocative cinematography utilizes a moody color palette comprised predominantly of greys and navy blues. Evy leaves the house just once, and the camera doesn’t go with her, so it’s hard to identify the season, but Undertone certainly feels like a wintry film. It helps that Mama’s house isn’t the most welcoming environment, as religious iconography fills every available spot, including a cross hanging on the dying character’s bedroom door and a variety of different statues that loom ominously behind the podcaster as she records. Evy repeatedly listens to an old voicemail from her mother, in which Mama intones “I’m praying for you.” At first, it seems like a sweet sentiment, but as the story progresses, the idea curdles into something closer to a threat.
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Tuason infuses Undertone with Catholic guilt, right down to a bottle of Irish whiskey that Evy — a possible alcoholic — pulls out of a liquor cabinet in a moment of desperation. The filmmaker’s suffocating feature debut adeptly tackles thorny themes of postpartum depression and guilt, and all while stoking a constricting feeling of loneliness for the protagonist. The atmosphere starts off chilly, and by Undertone’s closing moments, it’s downright ice-cold. The movie cleverly emulates the effect of wearing noise-cancelling headphones each time Evy puts hers on, which forces the audience to focus solely on what she hears. The soundscapes are truly exceptional: layered, considered and beautifully composed to capture every little crackle and hum, while repetitive recordings — seemingly full of hidden meanings — similarly encourage viewers to pay closer attention, which makes Undertone’s darkest moments hit even harder.
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Undertone is a slow burn, and there will be those who complain that nothing happens, but the scares are interlaced throughout the narrative, increasing in frequency and intensity as it goes on. Unlike Skinamarink (2022), which has little to offer hardcore horror fans, Tuason’s movie builds the tension deliberately, with an acute attention to detail that pays off the closer one looks and listens. The resonant sound design echoes Kiri’s skilled performance in the lead role, as she acts predominantly by herself, often wordlessly communicating Evy’s disbelief, fear and confusion as the character grapples with her horrifying predicament alongside handling her mother’s rapidly deteriorating condition (and a surprise pregnancy to boot). Tuason keeps the camera tight on her face, emphasizing the presumed safety of Evy’s headphones as she disappears into the world of the titular podcast, which usually gives the struggling young woman a break from her normal life.
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The great tragedy of Undertone is that poor Evy unwittingly invites something even worse into her mother’s home, which already feels haunted thanks to the almost-dead woman upstairs, as well as the wealth of troubled childhood memories seeping out of its walls. There’s a wonderful piquancy to the movie — Tuason takes his time ratcheting up the tension, but Undertone doesn’t let up once it gets going. Moments of respite are few and far between, with Evy’s growing isolation becoming increasingly obvious to the audience, if not to her. It’s tough to capture the idea of feeling unsafe in your own home, but Undertone manages to achieve this without any obvious jump scares or visual shocks. It’s all about sound, including during the movie’s stomach-churning final moments, which play out against a black screen, further solidifying the power of sound.
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Podcasters typically don’t fare well in horror movies, with the most infamous example being those hideous Brits in Halloween (2018) who get exactly what they deserve. However, Evy is an empathetic yet flawed character — kind of a mess doing her best. It’s notable that being a skeptic doesn’t necessarily protect her from evil forces, but Tuason also doesn’t punish his protagonist for refusing to believe. Instead, he leaves it up to the audience to decide whether Evy, and to a lesser extent Justin, is being targeted or just unlucky. Tuason’s feature directorial debut proves once and for all that less really is more when it comes to crafting scares that resonate far beyond the frame (listening to a podcast immediately after a watch is a disconcerting experience). Undertone is inspired, unnerving and truly a future classic.
Undertone released digitally on April 14, 2026.
Joey Keogh (@JoeyLDG) is a writer from Dublin, Ireland with an unhealthy appetite for horror movies and Judge Judy. In stark contrast with every other Irish person ever, she’s straight edge. Hello to Jason Isaacs. Thank you for reading film criticism, movie reviews and film reviews at Vague Visages.
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