In a remote Spanish village, the tranquility of everyday life is disrupted by the appearance of a mysterious train. The rumble can only be heard at night, an unsettling sound that awakens the curiosity and fear of the locals. When a group of young people decides to investigate the strange phenomenon, they uncover dark secrets hidden in the train, connected to a local myth about supernatural creatures that inhabit the region. Everything takes a chilling turn when they realize that the legend is hunting them.
As the protagonists delve deeper into the investigation, they encounter a hermit who has been waiting for years for the return of the shadows that haunt the fields. With his help, the kids begin to unravel a tale of revenge and sacrifice that has been dormant for generations. However, the closer they get to the truth, the more dangerous the situation becomes, and they soon find themselves caught in a fight for survival.
As the train advances toward the village, a sense of inevitable hopelessness begins to take over. The young people must choose between fleeing or confronting their deepest fears, while the fate of their home hangs by a thread. An atmosphere of tension and mystery envelops each scene, leading us to a supernatural climax that challenges reality. Their lives will never be the same again.