IT LIVES. In a research hangar in Virginia, a Unit 51 team studies an ancient but long-dormant virus that can transform human physiology-and turn it into something else . . . IT MUTATES. In the Amazon rain forest, a newly evolving life form known as Subject Z acquires the ability to think conceptually, build elaborate traps, create new carriers-and spawn a new race . . . IT SPREADS. In Mexico and Turkey, the men and women of Unit 51 race to uncover a global link between the mutations: a connection as ancient as the oldest tombs on earth-and as alien and unknowable as the universe itself. But time is running out. The infected are growing in number. And the nightmare is going viral.