40-something Victor, humanities professor and amateur meteorologist, is a madcap, a friendly dabbler, who lives day by day, alongside is wife Anne.

From their daughters' menstruation to the birth of their dog, everything seems to be under control for Emanuele and Olivier. This morning, however, their youngest daughter Lea hasn't come down for breakfast. In her bed the parents and Emilie, their eldest, discover to their horror a monstrous cocoon. Gradually chaos takes over.

After his wife allegedly commits suicide, Vincent starts behaving very strangely, throwing away the weapon and moving the body, leading the police to start asking questions.