Rita Cerveau ("Brain"), the most intelligent woman in the world, is depressive.
In the heart of a city, the inhabitants of a tower wake up one morning to find that their building is shrouded in an opaque fog, obstructing doors and windows - a strange dark matter that devours anything that tries to pass through it. Trapped, the residents try to organize themselves, but to ensure their survival they gradually succumb to their most primitive instincts, until they sink into horror...
After disappearing overnight, a man reappears and discovers that he is the father of a little girl. This time he will do his best.
