<p>This introduction presents the articles collected in issue XX of the journal <em>Komodo 21</em>, which aim to initiate a an intermingling of the fields of radio and literature around the aesthetic, ethical and political issues raised by the increased use of testimonies and interviews. Since the 2000s, at the intersection of journalism and literature, books containing investigations, long-term reports and collections of testimonies – acclaimed by both critics and the public – have proliferated. This dossier explores the ways in which the medium of radio replays and influences the many issues that run through literary collection and investigation. Its originality lies in its testing of such hypotheses within several linguistic and cultural spaces (English-speaking, French-speaking, German-speaking, Russian-speaking and Ukrainian-speaking), thus offering the beginnings of a transnational panorama – and one that does not focus on the Anglo-Saxon domain – of the practices of investigative radio.</p>