Let's make cities a place where we can live sustainably and peacefully. Lía lives on her parents' farm, a place where she is happy and where every night she gets to contemplate the immense starry sky. When her family announces that they are going to visit her aunt and uncle, Lia is thrilled at the prospect of seeing the city. What she didn't realise is that the city is a place where everyone is in a hurry, the noise is constant, and at night it is impossible to make out even a single star. Together with her cousin Pablo, Lía starts a unique crusade to achieve a sustainable, clean and environmentally friendly city.