Undertone ending explained: Who is Abyzou?

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If you’ve ever felt creeped out by slowed-down versions of children’s songs, you might find the new horror movie, Undertone, genuinely frightening.

Ian Tuason’s first film as writer and director has been getting a lot of attention since it premiered at a film festival last year. While our review gave it two stars, putting it on the lower end of ratings, it’s now showing in UK cinemas and aiming to scare moviegoers.

The series features Nina Kiri, known for her role in The Handmaid’s Tale, as Evy. Evy cares for her mother, who is in a coma, and co-hosts a horror podcast with Justin (played by Adam Di Marco). On the podcast, they share spooky stories and reports of supernatural events sent in by their listeners.

I was immediately hooked at the beginning of this movie! It starts with these creepy voice recordings sent to the main characters by a couple, Mike and Jessa. They’re recordings of nursery rhymes – seriously, ‘London Bridge’ and ‘Baa Baa Black Sheep’ – but they’re totally distorted and terrifying. It sets such a disturbing tone right away!

When they started investigating the hidden meanings in these well-known songs, things quickly became strange and unsettling – even bordering on demonic.

Confused about how the movie Undertone ended? We’ve got a breakdown of the final scenes for you.

Undertone ending explained: Who is Abyzou?

As the movie progresses, Evy, who initially claims to be doubtful, starts to seem increasingly frightened by what she hears in the audio recordings. We also find out, through conversations she has on the phone, that she’s six weeks pregnant, but she’s still deciding if she wants to have the baby.

Playing one of Mike and Jessa’s recordings in reverse reveals a strange phrase – “Come in Abyzou” – which seems to be a key piece of the puzzle.

Evy and Justin’s research revealed Abyzou to be a figure from European folklore – a demon believed to cause miscarriages and, driven by envy, incite mothers to harm their own children.

Understandably, the news is upsetting for Evy, especially since she’s pregnant. To make things worse, she’s been experiencing increasingly strange and unsettling events at home. Her mother, who remains unconscious, seems to be moving on her own, and a statue of the Virgin Mary keeps turning up in odd locations.

As the recording nears its end, Jessa realizes she needs to warn the person who’s listening – and it seems that person is Evy.

A listener contacted the podcast to share disturbing news: Mike and Jessa were found dead at their home. They had plastic bags over their heads, and the walls were covered in drawings of babies. An autopsy also revealed that Jessa was pregnant.

Another caller, Abby, gets through to the podcast, clearly very upset and with her child crying. When it becomes clear she intends to harm her child, a frightened Evy confesses to killing her own mother. She then runs upstairs to find the walls covered in disturbing drawings of the demon Abyzou and images of bloody babies.

It seems Abyzou managed to get inside Evy’s home through the documents, and is now causing trouble for her. However, the movie ends before we learn what ultimately happens to Evy and her mother.

The movie ends without providing clear answers, but director Tuason shared with In Review Online that they specifically sought a demon from old stories known for harming children. The concept behind the story was that the character Evy doesn’t want to have a child, and perhaps she unintentionally calls upon this demon to relieve that pressure. That was the initial inspiration for the film.

I came across Abyzou, a demon described in the Testament of Solomon – an old, traditional religious text. She felt like a perfect fit for the film. It’s similar to how nursery rhymes are shared – the Testament of Solomon was originally passed down through storytelling.

He explained that the story of Solomon’s Testament began as an oral account of his experiences. Over time, passed down through generations, it evolved into the legendary figure we now know only as a creation of our imaginations.

Given how closely linked we all are through language and culture, it’s hard to dismiss the possibility that this thing actually exists.

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Undertone is now showing in UK cinemas.

Authors

Patrick CremonaSenior Film Writer

As a longtime film critic for TopMob – I’ve been with them since October 2019 – I cover everything hitting theaters and streaming services. Over the years, I’ve had the chance to chat with some major stars and have reviewed all sorts of films, from blockbusters to indie darlings. It’s a pretty great gig, honestly!

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2026-04-10 17:35