El Cuco de Cristal plot
Clara Merlo, a first-year medical resident, suffers a fatal heart attack and requires a heart transplant. During her recovery, she feels the need to meet her donor. This leads her to a small inland town to learn more about the life of the young man who gave her his heart. Clara thus delves into a place full of secrets, a mystery spanning twenty years, and a closed town where, on the day of her arrival, a baby disappears in a public park.