In Brizan, a quiet seaside resort in the french Landes, everything changes with the arrival of the first wave which, like a tsunami, will cause the disappearance of surfers and disrupt the intimate life of the inhabitants.

As the dreams of Didier Mathure, a brilliant space engineer, literally go up in smoke when his rocket explodes on take-off, he is transferred to head GEPAN, a unit specializing in UFOs. He is tasked with coming up with scientific explanations for the UFO sightings that are currently dominating the headlines. This is a nightmare job for a die-hard rationalist like him, and he is determined to find a way out as soon as he can.