“Can I go inside your heart?”
That is the question at the center of Other Mommy, and if it does not chill you a little, read it again slowly. Universal Pictures releases the film exclusively in theaters on October 9, and horror fans have already crowned it the Halloween season’s best bet. After watching the trailer, it is not hard to see why.
The setup
The film is adapted from Josh Malerman’s bestselling 2024 novel Incidents Around the House. Malerman wrote Bird Box, so he knows how to find the soft spot in a reader’s chest and press on it. The story follows Bela, a young girl played by Arabella Olivia Clark, who forms a bond with a supernatural entity inside her home. The entity looks uncannily like her own mother. It keeps asking to get inside her heart. What begins as an unusual friendship turns sinister as Bela realizes the presence she welcomed may be hunting her family.
Jessica Chastain plays both roles: Bela’s protective mother and the thing wearing her face. It is a dual performance built on small, awful details. Chastain has described finding the character’s unblinking smile and shaping every physical choice around what the entity would offer a lonely child: the mother Bela wishes she had. Jay Duplass plays her father, Daddo. The supporting cast includes Dichen Lachman as a paranormal scientist, Arian Moayed as a family friend, and screen legend Karen Allen, of Raiders of the Lost Ark fame, as Bela’s grandmother.
The team behind the dread
Director Rob Savage made his name with Host, the lockdown horror film shot entirely over video call, then proved he could go big-studio with The Boogeyman. He knows how to build dread out of nothing and how to spend a budget. Producer James Wan, the architect of Saw, Insidious and The Conjuring, backs the film through his Blumhouse and Atomic Monster banner. The screenplay comes from WGA Award winner Nathan Elston.
Savage recently told Entertainment Weekly the film contains around 50 jump scares, then immediately complicated his own count: a great scare, he argued, does not need the classic quiet-quiet-loud formula. What he promises instead is dread, set pieces and a deep paranoia where the audience can never quite tell whether they are looking at Mommy or Other Mommy, or whether any grown-up in the frame can be trusted. For a 93-minute horror film, that is a tight, mean machine.
Why it might actually get you
The trailer did something unusual. It played before The Odyssey in theaters and went properly viral, with audiences reporting genuine unease. That matters. Trailers are engineered to startle; this one reportedly left people sitting in the dark feeling wrong. The second trailer shows restraint too, holding back how the entity actually operates. In an era when marketing routinely spoils the third act, that discipline is encouraging.
There is also the Malerman factor. Incidents Around the House is told from a child’s perspective, and the novel’s power comes from the gap between what Bela understands and what the reader does. If the film keeps even half of that, it will be the rare horror movie that works as a drama too. Chastain does not do paycheck roles. She picked this one.
The scares, on paper
Savage’s recent interviews suggest a director thinking hard about craft, not just shocks. He talks about building scares without the classic quiet-quiet-loud formula, about dread as a sustained pressure rather than a series of pops. The final trailer hints at set pieces with real imagination: one sequence has the entity hunting Bela through an indoor play park, galloping down twisting slides before cornering the child in an endless ball pit. A ball pit. The most innocent place on earth, turned into a trap. That is the kind of image that lodges in your head and stays there.
The film’s best trick may be its ambiguity. Chastain herself has leaned into the question of whether Bela is seeing a monster or a darker side of her own mother. A horror film that keeps you guessing about reality for 93 minutes, led by an Oscar winner playing against herself, is exactly what October is for.
Plan your scare night
Horror this good deserves a full evening. Brave one of the 20 haunted houses in and around NYC to warm up, catch Other Mommy on October 9, and then cleanse your palate with something cheerful, like the city’s 2026 holiday tree and lights celebrations. Just remember the question. Can I go inside your heart? Answer carefully.
