Lola, the modern and chaotic grandmother of Edgar and Robert, took care of them after the death of her daughter a few years ago. The three live in a modest house of the outskirts in Barcelona, and nothing makes them suspect that their quiet life is about to change dramatically. Lola has entered an advanced Alzheimer's process and children, who are not willing to separate them and end up in a host place, will take care of her with great ingenuity and overflowing fantasy, hiding her disease. For this they will have to face, like Robert in their athletics competitions, more than 3,000 obstacles.

In the harsh post-war years' Catalan countryside, Andreu, a child that belongs to the losing side, finds the corpses of a man and his son in the forest. The authorities want his father to be made responsible of the deaths, but Andreu tries to help his father by finding out who truly killed them. In this search, Andreu develops a moral consciousness against a world of adults fed by lies. In order to survive, he betrays his own roots and ends up finding out the monster that lives within him.