Buenos Aires, Argentina, 1983. In the last and turbulent days of the military dictatorship, Alicia, a high school history teacher, begins to ask uncomfortable questions about the dark origins of Gaby, her adopted daughter.
Deep within Buenos Aires's labyrinthine subway system, a train mysteriously disappears along with its 30 passengers. The subway officials are greatly troubled and call in topographer Daniel Pratt to help them find it. Unfortunately, the tunnels are so vast and complex, that Pratt needs his mentor Hugo Mistein to help him. Unfortunately, he has vanished too.
An old man seems to direct the lives of the people who pass by on the street, under his balcony.
