*Retour sur l'anomalie belge* revisits the Belgian UFO wave that drew widespread attention in 1989 and 1990, when large numbers of witnesses reported triangular craft moving silently across the night sky. Bertrand Méheust approaches the episode as both a social phenomenon and a case study in collective interpretation, examining how witnesses, journalists, officials, researchers, and skeptics responded to the sightings. Rather than treating the events as either simple fact or simple delusion, the book looks at the conditions that allowed the wave to develop: media coverage, public anxiety, official statements, and the difficulty of interpreting ambiguous reports. It places the Belgian episode within a longer history of aerial anomalies and UFO panics while paying close attention to the specific cultural and institutional context of Belgium. The result is a reflective inquiry into how modern societies process extraordinary claims, uncertainty, and evidence.