Chris is a young man mourning the tragic loss of his parents. He lives in a small Parisian apartment and spends his nights isolated from the outside world. The arrival of a comet ignites his neighborhood's curiosity, as it coincides with the 11th anniversary of a notorious catastrophe that claimed the lives of Chris's parents. As the night progresses, Chris begins to notice strange occurrences and the transformation of the locals into violent, shadowy creatures.

Chaos envelops the streets as more people fall victim to the sinister forces brought on by the comet. Chris teams up with a few survivors, including his neighbor John and John's girlfriend Claire, as they attempt to navigate the dangers lurking in every corner. With rapid mutation spreading, they fight to avoid both the monstrous figures and the unknown path ahead while struggling to understand the true nature of the comet's influence.