‘undertone’ Trailer – Nina Kiri Stars in Ian Tuason’s A24 Sound-Driven Haunting Horror Film

A24 revealed a full official trailer for undertone, a chilling look at the atmospheric thriller written and directed by Ian Tuason in his feature film debut.

The movie stars Nina Kiri as Evy, a paranormal podcast host whose life becomes increasingly unnerving when she moves back home to care for her dying mother and begins receiving a series of mysterious audio recordings.

The cast also includes Adam DiMarco as Justin, Evy’s podcast co-host, alongside Michèle Duquet, Keana Lyn Bastidas, and Jeff Yung.

It leans heavily into sound design and psychological dread, using audio as its primary conduit of fear and tension and marking a fresh approach to modern horror storytelling.

undertone premiered at the 29th Fantasia International Film Festival and also screened at the Sundance Film Festival 2026. It is scheduled to hit U.S. theaters on March 13, 2026 via A24.

Here is the official synopsis of undertone: The host of a popular paranormal podcast becomes haunted by terrifying recordings mysteriously sent her way.

Evy, a host of a paranormal podcast, returns home to care for her dying mother. When she begins receiving ten mysterious audio recordings detailing strange occurrences in a couple’s house, the stories start to mirror her own life and push her toward paranoia and dread. The film uniquely confines most on-screen presence to Evy herself, with other characters heard primarily as voices creating a claustrophobic aural experience that heightens tension and invokes fear through what is heard rather than what is seen.

Director Ian Tuason has spoken about why undertone took shape the way it did, especially its sonic focus and intimate setting. Tuason explained that he didn’t have the budget for a sprawling production, so he leaned into something that could work in a one-location environment, which naturally evolved into horror. He said that, “I didn’t have enough money to make anything else except for a one-location film, and that, to me, would only work as a horror. Once I started developing it, I realized it was the perfect genre for what I was trying to say.”

In a review for RogerEbert.com, critic Brian Tallerico noted that the film holds viewers in the POV of Evy throughout its runtime, creating a tightly wound horror experience rooted in fear and paranoia. He wrote, “The relatively slow burn that is “undertone” culminates in one of the most truly chill-inducing final acts in recent memory. As Evy’s world collapses and “undertone” spirals in image and sound, we feel as trapped as she does.”

Watch the official trailers for undertone, above and below.