October 2, 1968. Much to his disappointment, Ulises Martinez finds himself stranded in Martín's bus station, five hours away from Mexico City. With telephone communications and transport cut off due to abnormal heavy downpour, eight commuters are trapped within four walls, experiencing a silent, sinister undercurrent of unbridled paranoia. Now, despair gives way to violence. Does the Mexican government have something to do with the pitiless, life-altering phenomenon? Or is it all the work of unfathomable, malevolent forces?