Solvent (2024)

American former soldier Gunner S. Holbrook joins Polish historian Dr. Krystyna Szczepanska to search an abandoned Austrian farmhouse for documents linked to former SS officer Wolfgang Zinggl. During the search, the team discovers a strange pipe in the cellar. After Szczepanska touches it and suffers a breakdown, the investigation is abandoned.

Holbrook later returns alone and discovers a yellow liquid beneath the cellar. After drinking it, he begins to hallucinate and hears Zinggl's voice. He learns that Zinggl's grandson, Ernst Bartholdi, sold Nazi memorabilia to far-right collectors. His visions lead him to the locations of mass graves at Chełmno, which he records in a notebook.

Szczepanska returns to the cellar and finds Holbrook dying. He gives her the notebook before sinking into the ground. In the end-credit scenes, Bartholdi is shown dead following his suicide, and three neo-Nazis arrive at the cellar, where an eye emerges from the ground.