A group of people move through a labyrinth of tunnels in the urban underground. They cut through the darkness with the multiple flashlights strapped to their bodies. During their journey, they'll have to face the dangers that lurk in the darkness and, what is worse, themselves.

Barcelona, Spain, 1912. The disappearance of a girl from a wealthy family triggers a series of events that will shake the weak foundations of a hypocritical society.