An unidentified virus wipes out most of the Earth's population and Leon, his mother, and younger sister Grace, who just moved to London from New York, must run for their lives. An unidentified virus wipes out most of the Earth's population, liquefying their bodies. The virus moves as if it has an agenda-- it adapts as it moves quickly across the planet. Leon, his mother, and younger sister Grace, who just moved to London from New York, must run for...

After annihilating all of humanity except for those in three refugee communities, the virus approaches the remaining humans with a choice that will ultimately decide their fate.