John Garrity, his estranged wife and their young son embark on a perilous journey to find sanctuary as a planet-killing comet hurtles toward Earth. Amid terrifying accounts of cities getting levelled, the Garritys experience the best and worst in humanity. As the countdown to the global apocalypse approaches zero, their incredible trek culminates in a desperate and last-minute flight to a possible safe haven.

It's the last day on earth, twelve hours before a cataclysmic event will end life as we know it. James makes his way across a lawless and chaotic city to the party to end all parties. Along the way, he somewhat reluctantly saves the life of a little girl named Rose who is desperately searching for her father. Stuck with the unexpected burden of responsibility, James is forced to come to terms with what really matters in life as the final hours tick away.