El hilo

After a week of confinement due to the pandemic, a teenager trapped alone in her apartment in Barcelona looks at the empty street and spies her neighbor across the street, Samuel, through the window. He realizes this right away and, although at first he calls her a gossip, they end up becoming friends. Together they will try to discover who is the mysterious stranger who dresses in yellow and prowls around the neighborhood, raising the alarms of the two protagonists. Could it be the criminal that the media call "the murderer of the Ensanche"?