She was the younger sister of his best friend, in love with the colour yellow and who created her own sky full of invented constellations. He was the rebel in the leather jacket who used his biro to draw everything that moved him. Together they raced through childhood, made memories and missed one another - even when the only barrier between them was the space between each other's lips. Now Julieta and Marco are two strangers destined to meet on the streets of Salamanca to find out whether the old songs were lying when they said that the Cape of Trafalgar lighthouse awaits them every evening. The past... The present... An oath, an hour glass containing the secret of time and the hope that "forever" might be hidden in the chords of the song "La chica de ayer" - Yesterday's girl.