What Belongs to Others (2026): Cast, Story and Release Details

Prepared by Movies Dock Editorial

What Belongs to Others follows Kasia, a professional burglar whose routine changes when she discovers a dead man inside a home she has entered. Rather than leave, she moves into the apartment and begins investigating who he was, setting up a mystery rooted in guilt, curiosity and an uneasy change of perspective.

What Belongs to Others is a 2026 Polish drama written and directed by Grzegorz Dębowski. The film centers on Kasia, a woman who makes a living breaking into other people’s homes and whose latest job leads her into an unexpected mystery.

After finding a dead man in an apartment, Kasia makes an unusual decision: she stays. By moving into the deceased man’s home and trying to learn more about him, she turns a criminal routine into a personal investigation.

What Belongs to Others movie details

Story without spoilers

Kasia’s work takes her into private homes, where she steals from people who are absent. During one break-in, she discovers the body of a man. Instead of reporting the discovery and leaving, Kasia occupies his apartment and starts searching for clues about his life and identity.

The premise places the character in an unfamiliar position. She is accustomed to entering other people’s spaces without permission, but the apartment now becomes the setting for a more sustained attempt to understand someone she never knew. The story’s central tension comes from what Kasia may learn as she investigates the man whose home she has taken over.

What to expect

As a drama built around a burglary, a death and an improvised investigation, What Belongs to Others combines an unusual moral premise with a character-focused mystery. The supplied story suggests a film concerned with Kasia’s decision to cross another boundary after discovering the body, while the apartment provides the confined setting for her search.

The film is in Polish and comes from Poland. Its premise leaves room for questions about identity, privacy and the stories attached to personal spaces, though the available information does not specify how those ideas are developed or resolved.

Cast and creative team

Monika Kwiatkowska plays Kasia, the film’s central character. The cast also includes Robert Mania, Ewa Pająk, Martyna Rozwadowska and Jadwiga Grygierczyk. Grzegorz Dębowski serves as both director and writer.

• Monika Kwiatkowska as Kasia
• Robert Mania
• Ewa Pająk
• Martyna Rozwadowska
• Jadwiga Grygierczyk

Release and production context

What Belongs to Others is a Polish production with a Polish-language presentation. It is listed with a release date of September 10, 2026, and its production companies are Blue Onion, Mazowiecki Instytut Kultury, Wojewódzki Dom Kultury w Rzeszowie, Koi Studio, ColorPRO – Studio Postprodukcji Filmowej and Uchostudio. A runtime is not supplied.

Production companies: Blue Onion, Mazowiecki Instytut Kultury, Wojewódzki Dom Kultury w Rzeszowie, Koi Studio, ColorPRO – Studio Postprodukcji Filmowej, Uchostudio

Movies Dock view

What Belongs to Others begins with a stark contradiction: a burglar discovers a death in the very kind of private space she normally violates, then chooses to remain there. With Monika Kwiatkowska leading the cast and Grzegorz Dębowski handling both writing and direction, the film presents a compact Polish drama built around an unresolved question of who the dead man was and why Kasia needs to find out.

Film data:
TMDB · IMDb