Inés and her grandmother Esperanza have always had a special relationship, but she waited until she turned thirty to ask her to tell her about her youth. Her grandmother opens the box of memories, determined to share details of her life that she had never shared before. The photographs from the family archive come to life with the rhythm of the songs hummed by her grandmother. The lyrics of "Batallón de modistillas," a cuplé from the late 19th century, set Inés's heart on fire and she begins to search.