English: Maximum suspense takes over the screen when a young, hard working girl who handled the Mexican Governments Archives is found murdered. Set in the early 1970s, this story unfolds the drama of four characters: a journalist, a historian, the son of an assassinated politician and a police agent, all of whom will try to discover in the corridors of this emblematic building the truth behind this assassination. They will unleash the most shocking political deceits of a party that claimed itself invulnerable.