A guilt-ridden microbiologist, haunted by thoughts of the world he might have saved. A brother and sister with nothing but each other search for direction in a dead world. An ostracized teen, spiraling into madness, seeks revenge against those who abused and bullied him. A ruthless convict crosses the country, leading a band of mutinous soldiers. A woman held captive plots her escape against impossible odds. They're all on a collision course, fated to meet on a mountaintop - where the dead rains down from the sky.