The Glass Booth casts a cinematic spotlight on the role of the interpreter, revealing their complex role as both witness and mediator. First employed prominently during the Nuremberg Trials, simultaneous interpretation is closely linked to conflict resolution, bilingualism, and the establishment of the United Nations. Through vignettes set in both extreme and familiar environments, the film portrays the processes of listening, speaking, and forgetting within acts of formal and informal interpretation. In this fragmented portrait, The Glass Booth highlights the often-hidden work of interpreters and its delicate, intersubjective nature.