After post-structuralism enjoined us to forget the notion of truth, the 21st century is reactivating it in the face of the generalization of lies. Today's era of post-truth, characterized by fake news, alternative facts, the fading of evidence, and the supremacy of narratives, makes it necessary to rethink the criteria of truth. François Noudelmann will draw on famous works of contemporary literature, historiography, and his practice to analyze such issues.