Original: El cuco de cristal
Hoping to learn more about her heart donor, a young doctor arrives in a mountain town where decades of mysterious tragedies plague the small community.
A tragic fire arouses an officer's suspicion. Decades later, his son's heart saves a doctor who comes to town hoping to learn more about her donor.
Clara joins the search party after the latest disappearance. Back in the past, Miguel looks for answers about the fire but his efforts are shut down.
Unsettled by his findings, Miguel delves deeper into his sister's disappearance. At the Tamborada festival, Clara learns more about Carlos and the town.
Miguel's obsession with the investigation causes friction at home. Clara makes sense of Carlos' discoveries as Juan delivers Marta a shocking truth.
In 1979, a young Yesques resident receives a severe warning from his mother. Years later, Miguel's growing doubts lead to an unexpected tragedy.
After another shocking event hits Yesques, the authorities do their best to prevent a tragic outcome while a helpless Marta fears the worst.
