There is a case in Poland that has remained open for more than twenty-five years, the perpetrator never identified, the facts of the night of October 26 to 27, 1999, never fully assembled into a coherent account of what happened at the KD-1 signal box in Czerwionka-Leszczyny. Małgorzata Ż. was twenty-five years old, a railway worker at the Dębieńsko mine, and she was murdered at her station in the middle of a night shift that should have been unremarkable. No one has been charged. The case remains cold. And now, more than two and a half decades later, her story has been given two things she never received in the years since her death: a serious investigative documentary examination, and music that tries to give sound to what happened in that signal box and in the silence that followed. SADFACE, the project of Polish composer Paweł Gregorczyk, has made Unsolved KD-1, a five-track EP released May 5, 2026, that serves as the soundtrack to the TVN24+ documentary Who Killed the Railway Worker? The Mystery of the KD-1 Signal Box, and the result is one of the more serious and formally ambitious pieces of documentary music produced in Polish independent composition in recent years.
The naming of the tracks after Małgorzata, the German transliteration of her name appearing as Margarete across all five pieces, is a compositional decision that establishes the EP’s relationship to its subject from the first moment. This is not ambient music that happens to accompany a documentary, not background texture assembled to support other people’s visual storytelling. It is music that has taken the victim as its organizing principle, that places her name on every track as a reminder that behind the cold procedural language of true crime narrative is a specific person whose life ended violently and without explanation. The insistence on naming her, on refusing to allow the story to be purely about the mystery rather than about the woman at its center, is the ethical and artistic position that distinguishes Unsolved KD-1 from the more exploitative end of true crime’s musical accompaniment tradition.
Gregorczyk entered the project at an unusually early stage, the collaboration with filmmaker Andrzej Kuberski beginning before the documentary existed in its final form, the raw footage and the developing music influencing each other in ways that allowed the two creative processes to genuinely inform rather than merely illustrate one another. Kuberski’s precise definition of the emotions the music needed to reflect, emerging from his deep immersion in the cinematography and editing of the film, gave Gregorczyk a creative brief that was specific enough to generate genuine compositional decisions rather than general enough to permit atmospheric approximation. The resulting tracks are not scored to picture in the conventional sense but developed in relationship to the story and its emotional logic, which produces a different and in this case more powerful kind of integration between sound and documentary purpose.
Margarete: Das Motiv opens the EP with the quality of an establishing statement, the harmonic and textural introduction of the musical language that will develop across the subsequent four tracks. The motif of the title is doing double compositional work, referring both to the criminal concept of motive and to the musical concept of the recurring thematic element, and this deliberate ambiguity places the EP immediately in the space where crime narrative and musical form speak the same language. The claustrophobic brass that characterizes the more aggressive passages of the EP appears here in its initial statement, the tightness of the arrangement creating the sense of constriction that a signal box, an isolated workplace in the middle of the night, would have generated for the person inside it as whatever arrived to end her shift also ended her life.
Margarete: Nachtwache, the night watch, is the track that most directly inhabits the timeline of the actual events, the hours of a night shift at a railway signal box translated into music that captures the particular quality of solitary nocturnal work, the attention required to function alone in an isolated environment, the way that time moves differently in those circumstances, both slower in its passage and more concentrated in its demand for presence. The icy string arrangements that counterbalance the brass elements across the EP are most prominent here, the cold quality of the strings evoking the October night air and the functional coldness of the industrial environment rather than the romantic coldness of conventional atmospheric string writing.
Margarete: Nachklang, Klavier, the piano version of the afterimage or echo that the German word nachklang describes, introduces the most intimate and most stripped-back moment in the EP’s arc, the piano’s solitude mirroring the solitude of the signal box and creating space for a different quality of reflection than the more orchestrated pieces permit. Nachklang in German refers to the sound that lingers after the main sound has ceased, the resonance that continues in the air and in the listener after the note has been struck, and the track’s title applied to the case it is documenting carries the obvious and painful implication that Małgorzata Ż. has been a nachklang for twenty-five years, a resonance without resolution.
Margarete: Blutspur is the EP’s most visceral piece and the one accompanied by a music video inspired by the German Expressionist horror cinema tradition, Nosferatu, The Cabinet of Dr. Caligari, and Waxworks providing the visual language through which the tragedy of the KD-1 mystery is approached. Blutspur means blood trace or bloody track, and the aggressive, almost claustrophobic brass that the track’s description emphasizes is the musical equivalent of confrontation, the moment in the EP when the atmospheric tension of the earlier pieces gives way to something more direct and more disturbing. German Expressionism as a visual reference point is precisely chosen because that tradition was specifically concerned with how environments externalize psychological states, how architecture and light and shadow can make the interior of a mind visible, and Gregorczyk’s music performs a similar function, making the horror of the event audible through the distortion and compression of the musical space.
Margarete: Nachklang, Ensemble, the ensemble version of the afterimage, closes the EP by returning to the resonance concept with full orchestral forces rather than the piano’s solitude, the accumulated weight of everything that has preceded it given its fullest expression in the final track. This is the sound of a community’s continued carrying of something unresolved, the ensemble as metaphor for the collective acknowledgment that the case remains open and that Małgorzata Ż. has not been forgotten, that her name remains attached to something still requiring resolution.
True crime as a cultural phenomenon has frequently been criticized for prioritizing the puzzle over the person, the mystery’s entertainment value over the humanity of the victim, and SADFACE’s approach to this material refuses that prioritization at every compositional level. Unsolved KD-1 is music made from grief and formal rigor in equal measure, sound that takes its subject seriously enough to build an entire musical language in her service. Twenty-six years have passed. The name is still Margarete. The signal box is still a place where something happened that has never been explained. The music does not solve the case. It honors the person who was lost to it.
The brass falls silent. The strings continue. The nachklang persists.
