In Brizan, a peaceful seaside resort in the Landes, everything changes with the arrival of a first Wave : a surge of clouds which will cause the disappearance of surfers. The first in a series of phenomena that the inhabitants of this small community will be confronted with, disrupting their intimate lives.

When astronomers detect a transmission from another galaxy, it is definitive proof of intelligent extra-terrestrial life. The world’s population waits for further contact with bated breath. They do not have to wait long. Within days, mankind is all but wiped out by a devastating attack; pockets of humanity are left in an eerily deserted world. As aliens hunt and kill those left alive, the survivors ask a burning question – who are these attackers and why are they hell-bent on our destruction?

Saïd leads a team of young elite cops and will have to find his place within his group while preventing a gang war from breaking out between Eric's family and that of the El Hassani brothers.