When a devastating earthquake--the Big One--hits Los Angeles, two strangers are brought together by an act of violence and must help each other survive the wrecked city. Beegie is riding the bus when the quake hits. The teenager was heading back to her unhappy foster home, but then she's thrown into a broken world. Roads crumble, storefronts shatter and people run wild. Dessa, a single mom, is enjoying a rare night out...