In the grey Turin of late October, young Leo is consumed by a pathological obsession with his mature literature professor, Eleonora Lisi. During a private lesson, the built-up tension breaks, dragging the boy into a dark whirlpool. What appears to be the climax of a forbidden desire turns out to be the beginning of a ruthless biological nightmare.

After a month of surviving in a city of monsters, Adam and his friends are looking to escape. But the city wants them to stay - forever.